chore: tweak styles

Signed-off-by: Scott Dover <[email protected]>

Author: Scott Dover

client/src/webview/DataViewer.css

@@ -102,16 +102,11 @@ button,
   height: 16px;
 }
 
-.dropdown button span {
+.dropdown button {
   background: url(../../../icons/light/more.svg);
   background-size: 16px 16px;
 }
 
-.dropdown button:hover,
-.dropdown.active button {
-  background: var(--vscode-toolbar-hoverBackground);
-}
-
 .vscode-dark .dropdown button {
   background: url(../../../icons/dark/more.svg);
   background-size: 16px 16px;