Remove truncation of owner in mobile view

Due to a recent change, the owner column appeared truncated without
reason in the mobile view.

This change removes an existing, but obsolete, CSS rule and instead
removes the max-width value on the owner and size columns. This allows
them to take up as much space as needed.

Bug: Issue 8401
Change-Id: I8057a2fef1d68ea91fb4fc601f349befa86edac9
diff --git a/polygerrit-ui/app/styles/gr-change-list-styles.html b/polygerrit-ui/app/styles/gr-change-list-styles.html
index c109381..7ba4fc6 100644
--- a/polygerrit-ui/app/styles/gr-change-list-styles.html
+++ b/polygerrit-ui/app/styles/gr-change-list-styles.html
@@ -171,7 +171,7 @@
         }
         .owner,
         .size {
-          width: auto;
+          max-width: none;
         }
       }
       @media only screen and (min-width: 1450px) {