css: Don't override padding of all inputs in controls

inputs are expected to have their own padding and if
that doesn't suit everywhere, they have to be adjusted.
Overriding padding and such stuff this generally is bad.
This also solves the problem that the filter editor
search field is missing its specific padding, yay. -.-

public/css/icinga/controls.less

@@ -193,7 +193,6 @@ input.search {
 
   input,
   select {
-    padding: .5em;
     max-width: 16em;
   }