git update-git-for-windows: make silent installation very silent

The command successfully identifies and downloads the update however when it
triggers the update it causes a license screen to display which requires
user interaction. Therefore the update can't be fully automated.

This is due to the installer only using the /SILENT option on the new
installer. Let's add also the /VERYSILENT option so that the installer
works as expected.

Signed-off-by: Leo D'Arcy <[email protected]>
Signed-off-by: Johannes Schindelin <[email protected]>

git-extra/git-update-git-for-windows

@@ -290,7 +290,7 @@ update_git_for_windows () {
 		echo "Downloading $filename" >&2
 	fi
 	curl -# -L -o $installer $download || return
-	start "" "$installer" /SILENT
+	start "" "$installer" /SILENT /VERYSILENT
 
 	# Kill all Bash processes (which will let MinTTY quit, too)"
 	#