[LyX/2.1.x] Fix table rotate conversion to 2.0 format

[Georg Baum]

commit b0664e0c98b92b23442e9e344b2c6ad124c88ac9
Author: Georg Baum <b...@lyx.org>
Date:   Thu May 1 13:48:44 2014 +0200

    Fix table rotate conversion to 2.0 format
    
    The old code did create invalid documents, since the space between the 
rotate
    flag dn the previous flag was removed.

diff --git a/lib/lyx2lyx/lyx_2_1.py b/lib/lyx2lyx/lyx_2_1.py
index 24bb22e..d327d87 100644
--- a/lib/lyx2lyx/lyx_2_1.py
+++ b/lib/lyx2lyx/lyx_2_1.py
@@ -911,7 +911,7 @@ def revert_cell_rotation(document):
           document.body[i] = rgx.sub('', document.body[i])
         elif value == "90":
           rgx = re.compile(r' rotate="[^"]+?"')
-          document.body[i] = rgx.sub('rotate="true"', document.body[i])
+          document.body[i] = rgx.sub(' rotate="true"', document.body[i])
         else:
           rgx = re.compile(r' rotate="[^"]+?"')
           load_rotating = True