MDL-70010 core: reconcile MOODLE_310_STABLE and master

There are some unexpected differences between 310 and master,
better reconcile them now. Note this is not 100% critical but,
as far as nothing exclusively for 4.0 has landed to master yet
only branch/version differences should exist.

theme/boost/scss/moodle/core.scss

@@ -219,7 +219,7 @@ div.dropdown-item {
     padding: 0;
 }
 
-.section li.movehere a.movehere {
+.section li.movehere a {
     display: block;
     width: 100%;
     height: 2rem;

theme/boost/style/moodle.css

@@ -9840,7 +9840,7 @@ div.dropdown-item:focus-within {
   margin: 0;
   padding: 0; }
 
-.section li.movehere a.movehere {
+.section li.movehere a {
   display: block;
   width: 100%;
   height: 2rem;

theme/classic/style/moodle.css

@@ -10044,7 +10044,7 @@ div.dropdown-item:focus-within {
   margin: 0;
   padding: 0; }
 
-.section li.movehere a.movehere {
+.section li.movehere a {
   display: block;
   width: 100%;
   height: 2rem;