fix 'multi find all'-test for ST2

Author: philippotto

tests/testMultiEditUtils.py

@@ -181,6 +181,7 @@ def testMultiFindAll(self):
     selection = self.view.sel()
 
     # select the first occurrences of abc and def
+    selection.clear()
     selection.add(sublime.Region(0, 3))
     selection.add(sublime.Region(4, 7))