Fix: Remove fastScrollModifier property - no longer supported in xterm.js

Author: Tajudeen

src/vs/workbench/contrib/terminal/browser/xterm/xtermTerminal.ts

@@ -225,7 +225,6 @@ export class XtermTerminal extends Disposable implements IXtermTerminal, IDetach
 			macOptionIsMeta: config.macOptionIsMeta,
 			macOptionClickForcesSelection: config.macOptionClickForcesSelection,
 			rightClickSelectsWord: config.rightClickBehavior === 'selectWord',
-			fastScrollModifier: 'alt',
 			fastScrollSensitivity: config.fastScrollSensitivity,
 			scrollSensitivity: config.mouseWheelScrollSensitivity,
 			scrollOnEraseInDisplay: true,