Fix checkbox focus styles in devices settings tab

This removes custom focus styles for checkboxes for the devices tab
that are no longer needed with the general styles.

Before: https://i.imgur.com/IVOFhoq.png
After: https://i.imgur.com/LsgJI4Q.png
Fixed: 390135039
Change-Id: Ib420509a7341beb012edc80d6cb38a6075e53936
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6396864
Auto-Submit: Kim-Anh Tran <[email protected]>
Commit-Queue: Benedikt Meurer <[email protected]>
Reviewed-by: Benedikt Meurer <[email protected]>

Author: ktran

front_end/panels/settings/emulation/devicesSettingsTab.css

@@ -54,10 +54,6 @@
   pointer-events: none;
 }
 
-.devices-list-checkbox:focus {
-  outline: auto 5px -webkit-focus-ring-color;
-}
-
 .device-name {
   white-space: nowrap;
   text-overflow: ellipsis;