Move robot comments buttons to the end for consistency

Change-Id: I33ccce062b6338f06b97df94e000d071afca6740
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.html b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.html
index 333ca9d..c7d5804 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.html
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.html
@@ -98,7 +98,7 @@
       }
       .robotActions {
         display: flex;
-        justify-content: flex-start;
+        justify-content: flex-end;
         padding-top: var(--spacing-m);
         border-top: 1px solid var(--border-color);
       }