Don't show indent guide in truly trailing whitespace

Lines that are all whitespace are considered trailing
whitespace and should display the indent guide.

But lines with leading and trailing whitespace should never
have the indent guide rendered in the trailing area.

src/app/token.coffee

@@ -92,7 +92,7 @@ class Token
           "<span class='#{classes}'>#{match}</span>"
       if hasTrailingWhitespace
         classes = []
-        classes.push('indent-guide') if hasIndentGuide
+        classes.push('indent-guide') if hasIndentGuide and not hasLeadingWhitespace
         classes.push('invisible-character') if invisibles.space
         classes.push('trailing-whitespace')
         classes = classes.join(' ')