Place inline diff comment dialogs in the 4th column. (go-gitea#18321)

Comment dialogs for inline comments should appear in 4th column (not 3rd column), this PR changes the column that the inline review comment is associated with.

This problem has occurred due to an unrecognised conflict between go-gitea#17562 and go-gitea#17315. 

Fix as zeripath suggested in go-gitea#18320

Fix go-gitea#18320 

Co-authored-by: zeripath <art27@cantab.net>

web_src/js/features/repo-issue.js

@@ -500,7 +500,7 @@ export function initRepoPullRequestReview() {
             <td class="lines-type-marker"></td>
             <td class="add-comment-right"></td>
           ` : `
-            <td colspan="2" class="lines-num"></td>
+            <td colspan="3" class="lines-num"></td>
             <td class="add-comment-left add-comment-right" colspan="2"></td>
           `}
         </tr>`);