MDL-47183 post-integration fixes

* Fixed typo with context_module::instance
* Fixed use of $mod->get_context()

blocks/site_main_menu/block_site_main_menu.php

@@ -128,7 +128,7 @@ class block_site_main_menu extends block_list {
                 } else {
                     $editbuttons = '';
                 }
-                if ($mod->visible || has_capability('moodle/course:viewhiddenactivities', $mod->get_context())) {
+                if ($mod->visible || has_capability('moodle/course:viewhiddenactivities', $mod->context)) {
                     if ($ismoving) {
                         if ($mod->id == $USER->activitycopy) {
                             continue;

blocks/social_activities/block_social_activities.php

@@ -130,7 +130,7 @@ class block_social_activities extends block_list {
                 } else {
                     $editbuttons = '';
                 }
-                if ($mod->visible || has_capability('moodle/course:viewhiddenactivities', $mod->get_context())) {
+                if ($mod->visible || has_capability('moodle/course:viewhiddenactivities', $mod->context)) {
                     if ($ismoving) {
                         if ($mod->id == $USER->activitycopy) {
                             continue;

course/format/singleactivity/lib.php

@@ -79,7 +79,7 @@ class format_singleactivity extends format_base {
                 $orphanednode->nodetype = navigation_node::NODETYPE_BRANCH;
                 $orphanednode->add_class('orphaned');
                 foreach ($modinfo->sections[1] as $cmid) {
-                    if (has_capability('moodle/course:viewhiddenactivities', context_module($cmid))) {
+                    if (has_capability('moodle/course:viewhiddenactivities', context_module::instance($cmid))) {
                         $this->navigation_add_activity($orphanednode, $modinfo->cms[$cmid]);
                     }
                 }

course/renderer.php

@@ -770,7 +770,7 @@ class core_course_renderer extends plugin_renderer_base {
         if ($mod->uservisible) {
             $conditionalhidden = $this->is_cm_conditionally_hidden($mod);
             $accessiblebutdim = (!$mod->visible || $conditionalhidden) &&
-                has_capability('moodle/course:viewhiddenactivities', $mod->get_context());
+                has_capability('moodle/course:viewhiddenactivities', $mod->context);
             if ($accessiblebutdim) {
                 $linkclasses .= ' dimmed';
                 $textclasses .= ' dimmed_text';
@@ -827,7 +827,7 @@ class core_course_renderer extends plugin_renderer_base {
         if ($mod->uservisible) {
             $conditionalhidden = $this->is_cm_conditionally_hidden($mod);
             $accessiblebutdim = (!$mod->visible || $conditionalhidden) &&
-                has_capability('moodle/course:viewhiddenactivities', $mod->get_context());
+                has_capability('moodle/course:viewhiddenactivities', $mod->context);
             if ($accessiblebutdim) {
                 $textclasses .= ' dimmed_text';
                 if ($conditionalhidden) {