change default disabled text area area colour

[anubhajoshi01]

Proposed Changes

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...

Changed the default disabled text-area colour to light grey in light mode.

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[coveralls]

Pull Request Test Coverage Report for Build 11427142147

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.651%

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Totals
Change from base Build 11376796858:	0.0%
Covered Lines:	40656
Relevant Lines:	43687

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💛 - Coveralls

[david-yz-liu]

@anubhajoshi01 this is good, but there's also the constant definition in app/assets/javascripts/theme_colors.js. I'm not actually sure both are used, but for now please change both.