update Windows build scripts

dist/win/build.bat

@@ -11,7 +11,7 @@ SET HELP_URL="https://cryptomator.org/contact/"
 SET MODULE_AND_MAIN_CLASS="org.cryptomator.desktop/org.cryptomator.launcher.Cryptomator"
 SET LOOPBACK_ALIAS="cryptomator-vault"
 
-powershell -NoLogo -NoProfile -ExecutionPolicy Unrestricted -Command .\build.ps1^
+pwsh -NoLogo -NoProfile -ExecutionPolicy Unrestricted -Command .\build.ps1^
  -AppName %APPNAME%^
  -MainJarGlob "%MAIN_JAR_GLOB%"^
  -ModuleAndMainClass "%MODULE_AND_MAIN_CLASS%"^

dist/win/build.ps1

@@ -60,14 +60,14 @@ if( !(Test-Path -Path $javaFxJmods) ) {
 	Invoke-WebRequest $javaFxJmodsUrl -OutFile $javaFxJmods # redirects are followed by default
 }
 
-$jmodsChecksumActual = $(Get-FileHash -Path $javaFxJmods -Algorithm SHA256).Hash
+$jmodsChecksumActual = $(Get-FileHash -Path $javaFxJmods -Algorithm SHA256).Hash.ToLower()
 if( $jmodsChecksumActual -ne $javaFxJmodsSHA256 ) {
 	Write-Error "Checksum mismatch for jfxJmods.zip. Expected: $javaFxJmodsSHA256
 , actual: $jmodsChecksumActual"
 	exit 1;
 }
 Expand-Archive -Path $javaFxJmods -Force -DestinationPath ".\resources\"
-Remove-Item -Recurse -Force -Path ".\resources\javafx-jmods"
+Remove-Item -Recurse -Force -Path ".\resources\javafx-jmods" -ErrorAction Ignore
 Move-Item -Force -Path ".\resources\javafx-jmods-*" -Destination ".\resources\javafx-jmods" -ErrorAction Stop
 
 ## create custom runtime