Fix install_gui.ps1 when passing in a git commit/branch in Windows (#21142)

fix install gui when passing in a git commit/branch in windows

Install-gui.ps1

@@ -17,19 +17,19 @@ if ($null -eq (Get-Command node -ErrorAction SilentlyContinue))
 Write-Output "Running 'git submodule update --init --recursive'."
 Write-Output ""
 git submodule update --init --recursive
-if ( $SUBMODULE_BRANCH ) {
-  git fetch --all
-  git reset --hard $SUBMODULE_BRANCH
-  Write-Output ""
-  Write-Output "Building the GUI with branch $SUBMODULE_BRANCH"
-  Write-Output ""
-}
-
 
 Push-Location
 try {
     Set-Location chia-blockchain-gui
 
+    if ( $SUBMODULE_BRANCH ) {
+      git fetch --all
+      git reset --hard $SUBMODULE_BRANCH
+      Write-Output ""
+      Write-Output "Building the GUI with branch $SUBMODULE_BRANCH"
+      Write-Output ""
+    }
+
     $ErrorActionPreference = "SilentlyContinue"
     npm ci --loglevel=error
     npm audit fix