Merge pull request #24632 from overleaf/mf-tear-down-group-tab-improvements-split-test

[web] Tear down `group-tab-improvements` split test and apply the `default` variant

GitOrigin-RevId: c2fe07d0b4338f85b053637d85a05bbcbcce74ea

services/web/frontend/stylesheets/app/plans.less

@@ -470,18 +470,6 @@
     line-height: var(--line-height-02);
   }
 
-  .plans-new-root-group-member-picker {
-    margin: var(--spacing-10) auto 0 auto;
-
-    @media (min-width: @screen-sm-min) {
-      width: @group-member-picker-sm-width;
-    }
-    @media (min-width: @screen-md-min) {
-      width: @group-member-picker-md-width;
-      min-width: @group-member-picker-min-width; // ensure checkbox title doesn't wrap in English
-    }
-  }
-
   .plans-new-group-member-picker {
     .plans-new-group-member-picker-text {
       font-size: var(--font-size-02);