temp solution to make room settings usable

make mx_fadable not do anything anymore, and make room settings
full size.

Room settings haven't been designed yet, so all of this will
have a full pass when we have a go at it.

res/css/_common.scss

@@ -75,11 +75,6 @@ textarea {
     transition: opacity 0.2s ease-in-out;
 }
 
-.mx_fadable.mx_fadable_faded {
-    opacity: 0.3;
-    pointer-events: none;
-}
-
 /* XXX: critical hack to GeminiScrollbar to allow them to work in FF 42 and Chrome 48.
    Stop the scrollbar view from pushing out the container's overall sizing, which causes
    flexbox to adapt to the new size and cause the view to keep growing.