fix(chips): Fix readonly padding issue.

In readonly mode, the dynamic chips had an additional bit of padding
that made them inconsistent with static chips and caused the inner
text to not be centered.

Fixes #2829 (already closed, but people mentioned it in comments)

src/components/chips/chips.scss

@@ -65,6 +65,10 @@ $contact-chip-name-width: rem(12) !default;
 
     .md-chip:not(.md-readonly) {
       padding-right: $chip-remove-padding-right;
+
+      .md-chip-content {
+        padding-right:rem(0.4);
+      }
     }
   }
 
@@ -83,7 +87,6 @@ $contact-chip-name-width: rem(12) !default;
 
     .md-chip-content {
       display: block;
-      padding-right:rem(0.4);
       float: left;
       white-space: nowrap;
       max-width: 100%;