fix : workspace.open with initial cursor position bug

When opening already opened file via `atom.workspace.open(path,{ initialLine: 0,  initialColumn: 0, searchAllPanes: true} )`, cursor position doesn't move `[0,0]`.

Expected result:
Whether or not file is opened already, cursor position has to be [0,0].

src/workspace.coffee

@@ -472,7 +472,7 @@ class Workspace extends Model
           initialLine = options.initialLine
         if Number.isFinite(options.initialColumn)
           initialColumn = options.initialColumn
-        if initialLine > 0 or initialColumn > 0
+        if initialLine > 0 or initialColumn > 0 or options.initialLine? or options.initialColumn?
           item.setCursorBufferPosition?([initialLine, initialColumn])
 
         index = pane.getActiveItemIndex()