Add proper invisibles in empty lines with indent guide

This fixes a regression where multiple end of line invisibles were
displayed on empty lines when the indent guide was also enabled.

The invisibles array used to be shifted and not it isn't but the
entire array was still being iterated over causing extra invisibles
to be added to the line.

spec/editor-spec.coffee

@@ -1644,12 +1644,14 @@ describe "Editor", ->
 
           expect(editor.renderedLines.find('.line:eq(10) .indent-guide').length).toBe 1
           expect(editor.renderedLines.find('.line:eq(10) .indent-guide').text()).toBe "#{eol} "
+          expect(editor.renderedLines.find('.line:eq(10) .invisible-character').text()).toBe eol
 
           editor.setCursorBufferPosition([9])
           editor.indent()
 
           expect(editor.renderedLines.find('.line:eq(10) .indent-guide').length).toBe 2
           expect(editor.renderedLines.find('.line:eq(10) .indent-guide').text()).toBe "#{eol}   "
+          expect(editor.renderedLines.find('.line:eq(10) .invisible-character').text()).toBe eol
 
   describe "when soft-wrap is enabled", ->
     beforeEach ->

src/editor.coffee

@@ -1771,8 +1771,8 @@ class Editor extends View
           indentLevelHtml += "</span>"
           indentGuideHtml += indentLevelHtml
 
-        for invisible in eolInvisibles
-          indentGuideHtml += "<span class='invisible-character'>#{invisible}</span>"
+        while indentCharIndex < eolInvisibles.length
+          indentGuideHtml += "<span class='invisible-character'>#{eolInvisibles[indentCharIndex++]}</span>"
 
         return indentGuideHtml