Remove unused parameter in call to unloadVectorData

extends mapbox#3351 which changed the function unloadVectorData to take 0 parameters instead of 1. 

* FIX unloadVectorData call with 1 argument where 0 are expected

* Changed test to assert that unloadVectorData is called with 0 parameters before overwriting

Author: lkrombeen

src/source/tile.js

@@ -69,7 +69,7 @@ class Tile {
      */
     loadVectorData(data, painter) {
         if (this.hasData()) {
-            this.unloadVectorData(painter);
+            this.unloadVectorData();
         }
 
         this.state = 'loaded';

test/unit/source/tile.test.js

@@ -87,7 +87,7 @@ test('querySourceFeatures', (t) => {
 
         tile.loadVectorData(null, painter);
 
-        t.ok(tile.unloadVectorData.calledWith(painter));
+        t.ok(tile.unloadVectorData.calledWith());
         t.end();
     });