Fixed statusbar foreground color in debug mode

[ChayaLau]

What it does

Fixed statusbar foreground color in debug mode of color theme

How to test

1. open a color theme contribution.
2. set the api of statusbar.debuggingForground to desired color (not black to see difference)
3. generate a vsix from the extention
4. install the above vsix in a theia runnable project
5. click the setting button -> color theme and select the installed theme
6. run the debug.
   expected results: statusbar foreground color changed as declared
   prev res: statusbar foreground color did not change as declared

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

@ChayaLau the idea is good, but the implementation should not be in core but rather debug (as it is debug specific):

theia/packages/debug/src/browser/style/index.css

Lines 421 to 426 in 07aacaa

	/* Status Bar */
	.theia-mod-debugging #theia-statusBar {
	background: var(--theia-statusBar-debuggingBackground);
	color: var(--theia-statusBar-debuggingForeground);
	border-top: var(--theia-border-width) solid var(--theia-statusBar-debuggingBorder);
	}

[JonasHelming]

@ChayaLau Do you plan to adapt your PR according to the feedback?

[msujew]

@JonasHelming I believe @ChayaLau isn't working on/with Theia anymore, see #10137. Someone else should probably take over this PR if they want it to be merged.