Tighten up vertical padding in tool menu.

1. There was extra padding at the bottom of each section which created
   extra space when everything was collapsed

2. Label padding now matches section padding.

client/galaxy/style/scss/base.scss

@@ -1483,10 +1483,6 @@ div.permissionContainer {
     min-height: 100%;
 }
 
-div.toolSectionWrapper {
-    @extend .mb-1;
-}
-
 div.toolSectionTitle {
     font-weight: 500;
     font-size: $h4-font-size;
@@ -1496,8 +1492,7 @@ div.toolSectionTitle {
 }
 
 div.toolPanelLabel {
-    @extend .mt-3;
-    @extend .mb-2;
+    @extend .py-1;
     @extend .px-3;
     font-weight: bold;
     font-size: $h4-font-size;