fix(query-builder): fix for comments

- fix query builder border radius
- fix padding on the subquery header
- fix labels colors
- fix bootstrap condition buttons text transform
- fix colors
- fix min width of the fields that are outside of subquery header
- fix button size in filtering dialog to be medium in all size variants
- cleanup unused code

Author: desig9stein

projects/igniteui-angular/src/lib/core/styles/components/grid/_excel-filtering-theme.scss

@@ -724,6 +724,8 @@
     }
 
     %grid-excel-menu__secondary-footer {
+        --ig-size: 2;
+
         padding-inline: if($variant != 'bootstrap', rem(24px), rem(16px));
         padding-block-end: if($variant != 'bootstrap', rem(24px), rem(16px));
 

projects/igniteui-angular/src/lib/core/styles/components/query-builder/_query-builder-component.scss

@@ -4,10 +4,7 @@
 /// @access private
 /// @author <a href="https://github.com/simeonoff" target="_blank">Simeon Simeonoff</a>
 @mixin component {
-    //@include _builder-legend();
     @include _advanced-filtering-tree();
-    @include _advanced-filtering-con-menu();
-    @include _advanced-filtering-empty();
     @include _query-builder-tree();
     @include _query-builder-dialog();
 
@@ -148,30 +145,6 @@
     }
 }
 
-@mixin _advanced-filtering-con-menu {
-    @include b(igx-filter-contextual-menu) {
-        @extend %filter-con-menu !optional;
-
-        @include e(close-btn) {
-            @extend %filter-con-menu__close-btn !optional;
-        }
-
-        @include e(delete-btn) {
-            @extend %filter-con-menu__delete-btn !optional;
-        }
-    }
-}
-
-@mixin _advanced-filtering-empty {
-    @include b(igx-filter-empty) {
-        @extend %filter-empty !optional;
-
-        @include e(title) {
-            @extend %filter-empty__title !optional;
-        }
-    }
-}
-
 @mixin _query-builder-tree {
     @include b(igx-query-builder-tree) {
         @extend %query-builder-tree !optional;