[PR feedback] Account for EuiFilterButton Emotion conversion

Author: cee-chen

x-pack/plugins/index_management/public/application/components/component_templates/component_template_selector/component_templates.scss

@@ -33,10 +33,14 @@ $heightHeader: $euiSizeL * 2;
     border-bottom: $euiBorderThin;
     border-top: $euiBorderThin;
     border-left: $euiBorderThin;
-    border-top-left-radius: 0;
-    border-bottom-left-radius: 0;
     box-shadow: none;
     height: $euiSizeXXL; /* [2] */
+
+    &,
+    & > :first-child .euiFilterButton { /* EUI specificity override */
+      border-top-left-radius: 0;
+      border-bottom-left-radius: 0;
+    }
   }
 
   &__listWrapper {