Fix occurrences of class$=... without [[...]]

If `class` is set to a simple string without [[...]], then it must not
use `$`, otherwise Polymer will not convert it and the class will not be
applied.

I have stumbled over this, because the sticky bottom in the reply dialog
was not working as expected anymore.

The css rules for `.container` did not make a difference, so I just
removed them.

Change-Id: Ia0944afa3f1f0cee36568e90740af062ea34abf9
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
index a0c6b83..59dcd0e 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
@@ -29,11 +29,6 @@
     :host([disabled]) .container {
       opacity: 0.5;
     }
-    .container {
-      display: flex;
-      flex-direction: column;
-      max-height: 100%;
-    }
     section {
       border-top: 1px solid var(--border-color);
       flex-shrink: 0;
@@ -261,7 +256,7 @@
     }
 
   </style>
-  <div class$="container" tabindex="-1">
+  <div tabindex="-1">
     <section class="peopleContainer">
       <gr-endpoint-decorator name="reply-reviewers">
         <gr-endpoint-param name="change" value="[[change]]"></gr-endpoint-param>
@@ -404,7 +399,7 @@
         Saving comments...
       </span>
     </section>
-    <div class$="stickyBottom newReplyDialog">
+    <div class="stickyBottom newReplyDialog">
       <gr-endpoint-decorator name="reply-bottom">
         <gr-endpoint-param name="change" value="[[change]]"></gr-endpoint-param>
         <section
diff --git a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts
index 10476cd..0edc57b 100644
--- a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts
+++ b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog_html.ts
@@ -45,7 +45,7 @@
     <div class="main" slot="main">[[text]]</div>
     <gr-button
       id="signIn"
-      class$="signInLink"
+      class="signInLink"
       hidden$="[[!showSignInButton]]"
       link=""
       slot="footer"