MDL-69682 theme_boost: remove minimum height of tables.

The change that introduced this property (a3124b15) is no longer
required, and it caused visual glitches on tables containing a
single row.

theme/boost/scss/moodle/core.scss

@@ -435,12 +435,10 @@ form.popupform div {
     overflow: auto;
 }
 
-// Minimum height required for a menu in a table inside a scrollable div.
 // Position required for table sizing inside a flex container.
 .no-overflow > .generaltable {
     position: relative;
     margin-bottom: 0;
-    min-height: 10em;
 }
 // Accessibility features
 

theme/boost/style/moodle.css

@@ -10037,8 +10037,7 @@ form.popupform div {
 
 .no-overflow > .generaltable {
   position: relative;
-  margin-bottom: 0;
-  min-height: 10em; }
+  margin-bottom: 0; }
 
 .accesshide {
   position: absolute;

theme/classic/style/moodle.css

@@ -10249,8 +10249,7 @@ form.popupform div {
 
 .no-overflow > .generaltable {
   position: relative;
-  margin-bottom: 0;
-  min-height: 10em; }
+  margin-bottom: 0; }
 
 .accesshide {
   position: absolute;