[ui] Fix incorrect sizing of <select> toolbar items.

https://crrev.com/c/6163607 put a fixed size on all `<select>` elements,
which was also incorrectly applied to toolbar items. Generally, the
global preset for `<select>` shouldn't put up a fixed size, but leave it
to the users to configure a fixed size if desired.

Fixed: 390216640
Bug: 383478771, 388445687
Change-Id: I87cbdd6c789ec8da587afa4ba5ab9cdf3fd5f9c4
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6170709
Reviewed-by: Kim-Anh Tran <[email protected]>
Commit-Queue: Benedikt Meurer <[email protected]>
Commit-Queue: Kim-Anh Tran <[email protected]>
Auto-Submit: Benedikt Meurer <[email protected]>

Author: bmeurer

front_end/ui/legacy/inspectorCommon.css

@@ -455,7 +455,6 @@ input[type="range"]:disabled::-webkit-slider-thumb {
 select {
   appearance: none;
   user-select: none;
-  width: var(--sys-size-22);
   height: var(--sys-size-11);
   border: var(--sys-size-1) solid var(--sys-color-neutral-outline);
   border-radius: var(--sys-shape-corner-extra-small);