winmake.ps1: Fix the syntax of the function call Win-SSHProxy

Add missing end of line in test/python/requirements.txt

Signed-off-by: Gunjan Vyas <vyasgun20@gmail.com>

winmake.ps1

@@ -279,7 +279,7 @@ switch ($target) {
         if ($args.Count -gt 1) {
             $ref = $args[1]
         }
-        Win-SSHProxy -Ref $ref
+        Win-SSHProxy($ref)
     }
     'installer' {
         if ($args.Count -gt 1) {