Fix menu position for rooms and participants

The default position (taking into account the CSS rules from the server)
of the menu in the room and participant lists shows the arrow aligned to
the center of the menu button. Moving it to the left is not needed, and
it causes the arrow to be no longer aligned with the center of the
button. Besides the contacts menu, which is already ignored in the CSS
rule, the other only element that has the "bubble" CSS class is the menu
in the participant list, so the rule can be safely removed.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

css/style.scss

@@ -658,11 +658,6 @@ video {
 	opacity: .3;
 }
 
-.bubble:not(.contactsmenu-popover),
-#app-navigation .app-navigation-entry-menu {
-	right: 4px;
-}
-
 #app-navigation .app-navigation-entry-menu li {
 	width: auto !important;
 	float: inherit;