Fix flex width (#33414) (#33418)

Backport #33414 by wxiaoguang

Fix #33409

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/css/repo/home-file-list.css

@@ -65,6 +65,7 @@
 }
 
 #repo-files-table .repo-file-last-commit {
+  min-width: 0; /* otherwise the flex axis is not limited and the text might overflow in Pale Moon */
   background: var(--color-box-header);
 }