test: change animation speed to reliably trigger <all> test

Author: nikku

test/spec/SimulationSpec.js

@@ -1217,7 +1217,7 @@ describe('simulation', function() {
       async function(simulator, animation) {
 
         // given
-        animation.setAnimationSpeed(1000);
+        animation.setAnimationSpeed(500);
 
         // when
         triggerElement('ALL_START');