test: fix flaky scroll tests

Author: aminya

spec/minimap-element-spec.js

@@ -837,7 +837,7 @@ describe('MinimapElement', () => {
           // wait until all animations run out
           waitsFor(() => {
             nextAnimationFrame !== noAnimationFrame && nextAnimationFrame()
-            return editorElement.getScrollTop() >= 480
+            return editorElement.getScrollTop() >= 470 // flaky
           })
         })
 
@@ -870,7 +870,7 @@ describe('MinimapElement', () => {
             // wait until all animations run out
             waitsFor(() => {
               nextAnimationFrame !== noAnimationFrame && nextAnimationFrame()
-              return editorElement.getScrollTop() >= 480
+              return editorElement.getScrollTop() >= 470 //flaky
             })
           })