MDL-79548 core: Update MoodleNet modal strings so they can be translated

Previously, the type of share (course/activity) was being injected into
the string, but not from a translation, so did not fully translate. The
MoodleNet type (resource) was working, but has also been replaced here
to avoid inserting one string into another (this was also unnecessary
while resource is the only possible option). This also meant the latter
string could be deprecated.

lib/navigationlib.php

@@ -4650,7 +4650,6 @@ class settings_navigation extends navigation_node {
                 $action = new action_link(new moodle_url(''), '', null, [
                     'data-action' => 'sendtomoodlenet',
                     'data-type' => 'course',
-                    'data-sharetype' => 'resource',
                 ]);
                 // Share course to MoodleNet link.
                 $coursenode->add(get_string('moodlenet:sharetomoodlenet', 'moodle'),
@@ -4942,7 +4941,6 @@ class settings_navigation extends navigation_node {
                 $action = new action_link(new moodle_url(''), '', null, [
                     'data-action' => 'sendtomoodlenet',
                     'data-type' => 'activity',
-                    'data-sharetype' => 'resource',
                 ]);
                 $modulenode->add(get_string('moodlenet:sharetomoodlenet', 'moodle'),
                     $action, self::TYPE_SETTING, null, 'exportmoodlenet')->set_force_into_more_menu(true);