prefsCleaner.bat: add -unattended flag (#1616)

* prefsCleaner.bat: add -unattended flag

Usage:
  prefsCleaner.bat -unattended

Skips the prompt for user input and proceeds when -unattended is specified. If omitted, default behaviour is unchanged.

---------

Signed-off-by: Keith Harrison <keithh@protonmail.com>
Co-authored-by: earthlng <earthlng@users.noreply.github.com>

prefsCleaner.bat

@@ -3,17 +3,19 @@ TITLE prefs.js cleaner
 
 REM ### prefs.js cleaner for Windows
 REM ## author: @claustromaniac
-REM ## version: 2.5
+REM ## version: 2.6
 
 CD /D "%~dp0"
 
+IF /I "%~1"=="-unattended" (SET _ua=1)
+
 :begin
 ECHO:
 ECHO:
 ECHO                 ########################################
 ECHO                 ####  prefs.js cleaner for Windows  ####
 ECHO                 ####        by claustromaniac       ####
-ECHO                 ####              v2.5              ####
+ECHO                 ####              v2.6              ####
 ECHO                 ########################################
 ECHO:
 CALL :message "This script should be run from your Firefox profile directory."
@@ -22,10 +24,13 @@ CALL :message "This will allow inactive preferences to be reset to their default
 ECHO   This Firefox profile shouldn't be in use during the process.
 CALL :message ""
 TIMEOUT 1 /nobreak >nul
-CHOICE /C SHE /N /M "Start [S] Help [H] Exit [E]"
-CLS
-IF ERRORLEVEL 3 (EXIT /B)
-IF ERRORLEVEL 2 (GOTO :showhelp)
+
+IF NOT DEFINED _ua (
+	CHOICE /C SHE /N /M "Start [S] Help [H] Exit [E]"
+	CLS
+	IF ERRORLEVEL 3 (EXIT /B)
+	IF ERRORLEVEL 2 (GOTO :showhelp)
+)
 IF NOT EXIST "user.js" (CALL :abort "user.js not found in the current directory." 30)
 IF NOT EXIST "prefs.js" (CALL :abort "prefs.js not found in the current directory." 30)
 CALL :strlenCheck