[UI] Fix commit messages breaking out of event history

Regression of 8b54d38cbe.
This is 7.0 specific path for the issue. The design of this area is not compatible with 8.0, and thus there's no startightforward way to make it look like on 8.0.

web_src/css/repo.css

@@ -185,6 +185,11 @@
   text-overflow: ellipsis;
 }
 
+/* path for 7.0 */
+.issue-content .commit-summary {
+  white-space: unset;
+}
+
 .commit-header .commit-summary,
 td .commit-summary {
   white-space: normal;