Style terminal background correctly in aux panel

Fixes microsoft#135919

Author: Tyriar

src/vs/workbench/contrib/terminal/browser/terminalInstance.ts

@@ -2084,7 +2084,7 @@ export class TerminalInstance extends Disposable implements ITerminalInstance {
 		if (this.target === TerminalLocation.Editor) {
 			backgroundColor = theme.getColor(TERMINAL_BACKGROUND_COLOR) || theme.getColor(editorBackground);
 		} else {
-			backgroundColor = theme.getColor(TERMINAL_BACKGROUND_COLOR) || (location === ViewContainerLocation.Sidebar ? theme.getColor(SIDE_BAR_BACKGROUND) : theme.getColor(PANEL_BACKGROUND));
+			backgroundColor = theme.getColor(TERMINAL_BACKGROUND_COLOR) || (location === ViewContainerLocation.Panel ? theme.getColor(PANEL_BACKGROUND) : theme.getColor(SIDE_BAR_BACKGROUND));
 		}
 		const cursorColor = theme.getColor(TERMINAL_CURSOR_FOREGROUND_COLOR) || foregroundColor;
 		const cursorAccentColor = theme.getColor(TERMINAL_CURSOR_BACKGROUND_COLOR) || backgroundColor;

src/vs/workbench/contrib/terminal/browser/terminalView.ts

@@ -264,6 +264,7 @@ registerThemingParticipant((theme: IColorTheme, collector: ICssStyleCollector) =
 
 	const sidebarBackgroundColor = theme.getColor(TERMINAL_BACKGROUND_COLOR) || theme.getColor(SIDE_BAR_BACKGROUND);
 	collector.addRule(`.monaco-workbench .part.sidebar .pane-body.integrated-terminal .terminal-outer-container { background-color: ${sidebarBackgroundColor ? sidebarBackgroundColor.toString() : ''}; }`);
+	collector.addRule(`.monaco-workbench .part.auxiliarybar .pane-body.integrated-terminal .terminal-outer-container { background-color: ${sidebarBackgroundColor ? sidebarBackgroundColor.toString() : ''}; }`);
 
 	const borderColor = theme.getColor(TERMINAL_BORDER_COLOR);
 	if (borderColor) {