Make ResetButton no longer part of search filtering

The button will now appear if and only if all the bindings in its section are visible (not filtered out by the search)

osu.Game/Overlays/Settings/Sections/Input/KeyBindingsSubsection.cs

@@ -75,5 +75,7 @@ namespace osu.Game.Overlays.Settings.Sections.Input
 
             Content.CornerRadius = 5;
         }
+
+        public override IEnumerable<string> FilterTerms => Enumerable.Empty<string>();
     }
 }