Bug 1484422 - Clean up fullscreen window controls styling. r=ntim

browser/themes/linux/browser.css

@@ -154,8 +154,6 @@ menuitem.bookmark-item {
 #restore-button,
 #close-button {
   -moz-appearance: none;
-  border: none;
-  margin: 0 !important;
   padding: 6px 12px;
   -moz-context-properties: stroke;
   stroke: currentColor;

browser/themes/windows/browser.css

@@ -402,8 +402,6 @@ menuitem.bookmark-item {
 #restore-button,
 #close-button {
   -moz-appearance: none;
-  border: none;
-  margin: 0 !important;
   padding: 6px 12px;
   -moz-context-properties: stroke;
   stroke: currentColor;