Don't retain "\r\n" when summarizing commits

Auditors: vrana

src/applications/repository/storage/PhabricatorRepositoryCommitData.php

@@ -25,7 +25,7 @@ final class PhabricatorRepositoryCommitData extends PhabricatorRepositoryDAO {
   public function getSummary() {
     $message = $this->getCommitMessage();
 
-    $summary = phutil_split_lines($message);
+    $summary = phutil_split_lines($message, $retain_endings = false);
     $summary = head($summary);
     $summary = phutil_utf8_shorten($summary, self::SUMMARY_MAX_LENGTH);