Remove orphan CSS selectors in slowvote/slowvote.css

Summary:
* slowvote-header-content
** Added in https://we.phorge.it/rP89ee928a51c72d9fda17a59f73b060a92cc0c665, usage removed in https://we.phorge.it/rPaa22a578d01b8b5c69c89b9dc4a370552534f6dd from `src/applications/slowvote/view/SlowvoteEmbedView.php`

Test Plan: Grep the code for each CSS selector (`grep --exclude="*.css" -R 'some-search-string' .`), also do partial searches, get no results.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D26003

resources/celerity/map.php

@@ -103,7 +103,7 @@ return array(
     'rsrc/css/application/project/project-view.css' => '567858b3',
     'rsrc/css/application/search/application-search-view.css' => '0f7c06d8',
     'rsrc/css/application/search/search-results.css' => '9ea70ace',
-    'rsrc/css/application/slowvote/slowvote.css' => '1694baed',
+    'rsrc/css/application/slowvote/slowvote.css' => 'd794f00c',
     'rsrc/css/application/tokens/tokens.css' => 'ce5a50bd',
     'rsrc/css/application/uiexample/example.css' => '549e220b',
     'rsrc/css/core/core.css' => '83d97073',
@@ -797,7 +797,7 @@ return array(
     'phabricator-remarkup-metadata' => 'e40c4991',
     'phabricator-search-results-css' => '9ea70ace',
     'phabricator-shaped-request' => '995f5102',
-    'phabricator-slowvote-css' => '1694baed',
+    'phabricator-slowvote-css' => 'd794f00c',
     'phabricator-source-code-view-css' => 'e382316a',
     'phabricator-standard-page-view' => '45aa515d',
     'phabricator-textareautils' => 'f340a484',

webroot/rsrc/css/application/slowvote/slowvote.css

@@ -6,10 +6,6 @@
   padding: 12px 16px 4px;
 }
 
-.slowvote-header-content {
-  padding: 8px;
-}
-
 .slowvote-body-content {
   padding: 8px 16px;
 }