Bookmark button colour doesn't update when switching between dark/light theme

[srirambv]

Description

Bookmark button colour doesn't update when switching between dark/light theme

Steps to Reproduce

1. Set browser theme to dark/default
2. Change theme to light
3. Bookmark button doesn't change colour unless you click it

Actual result:

Expected result:

Should change similar to other URL bar buttons

Reproduces how often:

100%

Brave version (chrome://version info)

Brave	0.55.4 Chromium: 70.0.3538.12 (Official Build) dev (64-bit)
Revision	ad61584ca32115f953ce656dd75b44f1c502a75d-refs/branch-heads/3538@{#179}
OS	Windows

Reproducible on current release:

NA

Website problems only:

• Does the issue resolve itself when disabling Brave Shields?
• Is the issue reproducible on the latest version of Chrome?

Additional Information

#974
cc: @kjozwiak @LaurenWags to verify on macOS

[LaurenWags]

Reproduced on macOS using 0.55.4

[bbondy]

@petemill merged label is only needed for PR. Thanks.

[LaurenWags]

Verified passed with

Brave	0.55.11 Chromium: 70.0.3538.35 (Official Build) beta(64-bit)
Revision	28dcb499844fa40c28d5f62e337876cb936f79f5-refs/branch-heads/3538@{#678}
OS	Mac OS X

Verification passed on

Brave	0.55.11 Chromium: 70.0.3538.35 (Official Build) beta (64-bit)
Revision	28dcb499844fa40c28d5f62e337876cb936f79f5-refs/branch-heads/3538@{#678}
OS	Windows 7

Verification Passed on

Brave	0.55.11 Chromium: 70.0.3538.35 (Official Build) beta (64-bit)
Revision	28dcb499844fa40c28d5f62e337876cb936f79f5-refs/branch-heads/3538@{#678}
OS	Linux

• Verified toggle between GTK+ and Classic theme on Linux