syncthing: simplify runtime test

Passed argument no longer contains the release.

Signed-off-by: Paul Spooren <mail@aparcar.org>

utils/syncthing/test.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-syncthing --version | grep "${2%%-*}"
+syncthing --version | grep "$2"