UI: Fix clicking change number in gr-change-view

Change [0] migrated from paper-button to md-button. This caused
an issue with clicking the change number. To fix this, adding
`position: relative` to the a element fixed it.

[0] Ifd80df1d156d772d5492fd253101bdc96c7d5160

Release-Notes: skip
Change-Id: Idec545dc04b48c261bfcc61f0db338d1fbc475dd
Signed-off-by: Paladox none <thomasmulhall410@yahoo.com>
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index fe1e49e..d679af57 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
@@ -879,6 +879,7 @@
         }
         a.changeNumber {
           margin-left: var(--spacing-xs);
+          position: relative;
         }
         gr-reply-dialog {
           width: calc(min(60em, 90vw));