Drop the filtering of :args and :argu from the session file.

I haven't experienced the bug that is hinted at in the comments, and I see the argument list as an essential part of the session information.

Author: inkarkat

autoload/xolox/session.vim

@@ -244,17 +244,6 @@ function! s:state_filter(line) " {{{3
   elseif a:line =~ '^file .\{-}__Tag_List__$'
     " Same trick (about the E95) for TagList.
     return '" ' . a:line
-  elseif a:line =~ '^args '
-    " The :mksession command adds an :args line to the session file, but when
-    " :args is executed during a session restore it edits the first file it is
-    " given, thereby breaking the session that the user was expecting to
-    " get... I consider this to be a bug in :mksession, but anyway :-).
-    return '" ' . a:line
-  elseif a:line =~ '^\(argglobal\|\dargu\)$'
-    " Because we disabled the :args command above we cause a potential error
-    " when :mksession adds corresponding :argglobal and/or :argument commands
-    " to the session script.
-    return '" ' . a:line
   elseif a:line =~ "^\\s*silent exe 'bwipe ' \\. s:wipebuf$" || a:line =~ '^unlet! s:wipebuf$'
     " Disable Vim's special handling of the initial, empty buffer because it
     " breaks restoring of special windows with content generated by a Vim