CommonInstaller: some ROMs use webviewstub instead of webview

CommonInstaller

@@ -956,12 +956,20 @@ install_bromite_webview () {
 			x86_64 ) BROMITE_ARCH=x86 ;;
 		esac
 
-		if [ -d /system/app/webview -a "${MODE}" = "SYSTEM" ]; then
-			echo "    backing up webview to /sdcard/nanodroid_backups/app/webview"
-			mkdir -p /sdcard/nanodroid_backups/app
-			rm -rf /sdcard/nanodroid_backups/app/webview
-			mv /system/app/webview /sdcard/nanodroid_backups/app/
-		fi
+		for app in webview webviewstub; do
+			if [ -d /system/app/${app} ]; then
+				if [ "${MODE}" = "SYSTEM" ]; then
+					echo "    backing up ${app} to /sdcard/nanodroid_backups/app/${app}"
+					mkdir -p /sdcard/nanodroid_backups/app
+					rm -rf /sdcard/nanodroid_backups/app/${app}
+					mv /system/app/${app} /sdcard/nanodroid_backups/app/
+				elif [ "${MODE}" = "MAGISK" ]; then
+					echo "    creating overlay for ${app}"
+					mkdir -p ${MODPATH}/system/app/${app}
+					touch ${MODPATH}/system/app/${app}/.replace
+				fi
+			fi
+		done
 
 		nanodroid_install_apk BromiteWebView_${BROMITE_ARCH} multilib webview
 	fi