Applied the symfony fixes to the Admin class too

Author: GrahamCampbell

src/Gitonomy/Git/Admin.php

@@ -154,17 +154,7 @@ private static function getProcess($command, array $args = [], array $options =
             'process_timeout'       => 3600,
         ], $options);
 
-        $commandline = array_merge([$options['command'], $command], $args);
-
-        // Backward compatible layer for Symfony Process < 4.0.
-        if (class_exists('Symfony\Component\Process\ProcessBuilder')) {
-            $commandline = implode(' ', array_map(
-                'Symfony\Component\Process\ProcessUtils::escapeArgument',
-                $commandline
-            ));
-        }
-
-        $process = new Process($commandline);
+        $process = new Process(array_merge([$options['command'], $command], $args));
         $process->setEnv($options['environment_variables']);
         $process->setTimeout($options['process_timeout']);
         $process->setIdleTimeout($options['process_timeout']);