Remove defunct OS X Chrome <select> printing bug workaround

Chrome fixed the bug as of v37:
https://code.google.com/p/chromium/issues/detail?id=282918

scss/_print.scss

@@ -67,12 +67,6 @@
   }
 
   // Bootstrap specific changes start
-  //
-  // Chrome (OSX) fix for https://github.com/twbs/bootstrap/issues/11245
-  // Once fixed, we can just straight up remove this.
-  select {
-    background: #fff !important;
-  }
 
   // Bootstrap components
   .navbar {