Go back to old terminal clear behavior

Fixes #49162

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

@@ -574,13 +574,7 @@ export class TerminalInstance implements ITerminalInstance {
 	}
 
 	public clear(): void {
-		if (this._shellLaunchConfig.executable && paths.basename(this._shellLaunchConfig.executable).match(/^(zsh|bash|bash\.exe)$/)) {
-			// If a supported shell is being used, clear xterm scrollback then clear shell (^L)
-			this._xterm.write('\x1b[3J');
-			this._processManager.write('\x0c');
-		} else {
-			this._xterm.clear();
-		}
+		this._xterm.clear();
 	}
 
 	private _refreshSelectionContextKey() {