Issue #3448354 by TravisCarden: Remove Needless '-b' option in 'git checkout' command for MRs.

Closes #3448354

drupalorg/includes/DrupalorgIssueFork.php

@@ -478,7 +478,7 @@ class DrupalorgIssueFork extends Entity {
         'help' => [
           '#type' => 'textfield',
           '#title' => t('Check out this branch'),
-          '#value' => 'git checkout -b ' . escapeshellarg($row->branch) . ' --track ' . $this->label() . '/' . escapeshellarg($row->branch),
+          '#value' => 'git checkout --track ' . $this->label() . '/' . escapeshellarg($row->branch),
           '#attributes' => [
             'class' => ['drupalorg-copy'],
             'readonly' => 'readonly',