Bug 1581096 - Align search panel engine icon with clock icons. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D45938

--HG--
extra : moz-landing-system : lando

browser/themes/shared/searchbar.inc.css

@@ -16,6 +16,18 @@
   width: 100%;
 }
 
+.search-panel-header {
+  font-weight: normal;
+  margin: 0;
+  padding: 3px;
+  color: var(--panel-disabled-color);
+}
+
+.search-panel-header > label {
+  margin-top: 2px;
+  margin-bottom: 1px;
+}
+
 /**
  * The borders of the various elements are specified as follows.
  *
@@ -34,6 +46,7 @@
   -moz-box-align: center;
   border-top: none !important;
   border-bottom: 1px solid var(--panel-separator-color);
+  padding-inline-start: 6px;
 }
 
 .search-panel-tree[collapsed=true] + .search-one-offs > .search-panel-header,
@@ -49,18 +62,6 @@
   border-bottom: 1px solid var(--panel-separator-color);
 }
 
-.search-panel-header {
-  font-weight: normal;
-  margin: 0;
-  padding: 3px;
-  color: var(--panel-disabled-color);
-}
-
-.search-panel-header > label {
-  margin-top: 2px;
-  margin-bottom: 1px;
-}
-
 .search-panel-input-value {
   color: var(--autocomplete-popup-color);
 }