When using vertical split try to use correct width for note list index

Before, the entire width of the window was used and as soon as one note
was opened the tags and date, etc would be invisible. This is inspired
by the work of @sanchon in implementing the SimplenoteListSize setting.

This doesn't account for the Vim configuration setting of numberwidth,
but I'm not sure if it should.

References #87

autoload/SimplenoteUtilities.py

@@ -147,6 +147,13 @@ def format_title(self, note):
 
         # get window width for proper formatting
         width = vim.current.window.width
+        # But if vertical, then we want to adjust this
+        # Doesn't take into account numberwidth vim setting, but I think that is a Vim issue/bug.
+        if vim.eval('s:vbuff == 1') == "1":
+            if vim.eval('s:listsize > 0') == "1":
+                width = int(vim.eval('s:listsize'))
+            else:
+                width = width/2
 
         # get note flags
         if "systemtags" in note: