Add missing -command argument in powershell call (#1909)

* updater: add missing PowerShell argument

* prefcleaner: add missing PowerShell argument

prefsCleaner.bat

@@ -3,7 +3,7 @@ TITLE prefs.js cleaner
 
 REM ### prefs.js cleaner for Windows
 REM ## author: @claustromaniac
-REM ## version: 2.7
+REM ## version: 2.8
 
 CD /D "%~dp0"
 
@@ -15,7 +15,7 @@ ECHO:
 ECHO                 ########################################
 ECHO                 ####  prefs.js cleaner for Windows  ####
 ECHO                 ####        by claustromaniac       ####
-ECHO                 ####              v2.7              ####
+ECHO                 ####              v2.8              ####
 ECHO                 ########################################
 ECHO:
 CALL :message "This script should be run from your Firefox profile directory."
@@ -37,7 +37,7 @@ CALL :strlenCheck
 CALL :FFcheck
 
 CALL :message "Backing up prefs.js..."
-FOR /F "delims=" %%# IN ('powershell get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
+FOR /F "delims=" %%# IN ('powershell -command get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
 COPY /B /V /Y prefs.js "prefs-backup-%ldt%.js"
 
 CALL :message "Cleaning prefs.js..."

updater.bat

@@ -3,7 +3,7 @@ TITLE arkenfox user.js updater
 
 REM ## arkenfox user.js updater for Windows
 REM ## author: @claustromaniac
-REM ## version: 4.19
+REM ## version: 4.20
 REM ## instructions: https://github.com/arkenfox/user.js/wiki/5.1-Updater-[Options]#-windows
 
 SET v=4.19
@@ -177,7 +177,7 @@ IF EXIST user.js.new (
 		IF DEFINED _singlebackup (
 			MOVE /Y user.js user.js.bak >nul
 		) ELSE (
-			FOR /F "delims=" %%# IN ('powershell get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
+			FOR /F "delims=" %%# IN ('powershell -command get-date -format "{yyyyMMdd_HHmmss}"') DO @SET ldt=%%#
 			MOVE /Y user.js "user-backup-!ldt!.js" >nul
 		)
 		REN user.js.new user.js