Remove redundant position property

I guess it was there to make a contrast with the CSS used for the
version for medium and large screens. However, it isn't necessary and
the absence of this property already makes a contrast with the presence
of the property for medium and large screens.

app/assets/stylesheets/advanced_search.scss

@@ -3,7 +3,6 @@
   cursor: pointer;
   float: left;
   margin: $line-height 0;
-  position: inherit;
 
   @include breakpoint(medium) {
     float: right;