Move terminal.foreground defaults to JS

Fixes #27230

src/vs/workbench/parts/terminal/electron-browser/media/terminal.css

@@ -9,12 +9,9 @@
 	display: flex;
 	flex-direction: column;
 	background-color: transparent!important;
-	color: #333;
 	-webkit-user-select: initial;
 	position: relative;
 }
-.vs-dark .monaco-workbench .panel.integrated-terminal { color: #CCC; }
-.hc-black .monaco-workbench .panel.integrated-terminal { color: #FFF; }
 
 .monaco-workbench .panel.integrated-terminal .terminal-outer-container {
 	height: 100%;

src/vs/workbench/parts/terminal/electron-browser/terminalColorRegistry.ts

@@ -14,7 +14,11 @@ import { registerColor, ColorIdentifier } from 'vs/platform/theme/common/colorRe
 export const ansiColorIdentifiers: ColorIdentifier[] = [];
 
 export const TERMINAL_BACKGROUND_COLOR = registerColor('terminal.background', null, nls.localize('terminal.background', 'The background color of the terminal, this allows coloring the terminal differently to the panel.'));
-export const TERMINAL_FOREGROUND_COLOR = registerColor('terminal.foreground', null, nls.localize('terminal.foreground', 'The foreground color of the terminal.'));
+export const TERMINAL_FOREGROUND_COLOR = registerColor('terminal.foreground', {
+	light: '#333333',
+	dark: '#CCCCCC',
+	hc: 'FFFFFF'
+}, nls.localize('terminal.foreground', 'The foreground color of the terminal.'));
 
 const ansiColorMap = {
 	'terminal.ansiBlack': {