fix: don't include source with issue URL comment

If TODO comment is a suffix to a line of
(executable) source, don't repeat the source
content when inserting the issue URL. But be sure
to still keep the same alignment.

Closes #229

main.py

@@ -78,7 +78,7 @@ def process_diff(diff, client=Client(), insert_issue_urls=False, parser=TodoPars
                         old_line = file_lines[line_number]
                         remove = fr'(?i:{raw_issue.identifier}).*{re.escape(raw_issue.title)}'
                         insert = f'Issue URL: {client.get_issue_url(new_issue_number)}'
-                        new_line = re.sub(remove, insert, old_line)
+                        new_line = re.sub('^.*'+remove, raw_issue.prefix + insert, old_line)
                         # make sure the above operation worked as intended
                         if new_line != old_line:
                             # Check if the URL line already exists, if so abort.