[DevTools] Set button hover color only when text color not red
[DevTools] Set button hover color only when text color not red

crrev.com/c/2152929 set a hover/focus color on all text buttons, but
didn't account for text colors other than blue, such as the Stop
button when Memory - Allocation Sampling is running. This CL fixes
that by only setting the hover color when the class is not .running.

Bug: 1078246
Change-Id: I71f9034e9027728c74b9d70a174493048b47fd96
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2182813
Reviewed-by: Paul Lewis <8915f5d5c39a08c5a3e8a8d7314756e4580816f9@chromium.org>
Commit-Queue: Livvie Lin <54c2345d0b1f4eb63337755673bca72b0ada932d@chromium.org>

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