Remove circle-shape parameter from the vote chip

Vote chips displayed in the Submit Requirements section are rectangular
shape therefore remove the `circle-shape` parameter from `gr-vote-chip`
definition in file's status owners approval hover content.

Note that `slot="vote-chip"` parameter was also removed as it is not
needed.

Change-Id: I140b5ce52429db3e20f16ffa55e083dfcec236a3

owners/web/gr-files.ts

diff --git a/owners/web/gr-files.ts b/owners/web/gr-files.ts
index 26ee727..fb33778 100644
--- a/owners/web/gr-files.ts
+++ b/owners/web/gr-files.ts
@@ -139,10 +139,8 @@
 
     const voteChip = this.approval
       ? html` <gr-vote-chip
-          slot="vote-chip"
           .vote=${this.approval}
           .label=${this.info}
-          circle-shape
         ></gr-vote-chip>`
       : nothing;