templates/submission: Fix alignment of commit message

Preformatted content must not be indented
because any space is kept in the output,
making the content wrongly indented.

When aligning message headers to the left,
the new HTML code has been indented
including some preformatted content indented with two spaces.

The fix is to remove the indent of the content.

Signed-off-by: Thomas Monjalon <[email protected]>
Fixes: fe34ab2 ("patch-detail: left align message headers")
Reviewed-by: Robin Jarry <[email protected]>
Reviewed-by: Stephen Finucane <[email protected]>
(cherry picked from commit 13bbc0d)

patchwork/templates/patchwork/submission.html

@@ -262,7 +262,7 @@ <h2>Message</h2>
     <span class="message-date">{{ submission.date }} UTC</span>
   </div>
   <pre class="content">
-  {{ submission|commentsyntax }}
+{{ submission|commentsyntax }}
   </pre>
 </div>