Work around indentation bug with b'{' (vim-python#75)

Author: lunaynx

syntax/python.vim

@@ -170,8 +170,8 @@ if s:Python2Syntax()
     syn region pythonString   start=+[bB]\='''+ skip=+\\'+ end=+'''+ keepend contains=pythonBytesEscape,pythonBytesEscapeError,pythonUniEscape,pythonUniEscapeError,pythonDocTest,pythonSpaceError,@Spell
 else
     " Python 3 byte strings
-    syn region pythonBytes    start=+[bB]'+ skip=+\\\\\|\\'\|\\$+ excludenl end=+'+ end=+$+ keepend contains=pythonBytesError,pythonBytesContent,@Spell
-    syn region pythonBytes    start=+[bB]"+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end=+$+ keepend contains=pythonBytesError,pythonBytesContent,@Spell
+    syn region pythonBytes    start=+[bB]'+ skip=+\\\\\|\\'\|\\$+ excludenl end=+'+ end=+$+ keepend contains=@Spell
+    syn region pythonBytes    start=+[bB]"+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end=+$+ keepend contains=@Spell
     syn region pythonBytes    start=+[bB]'''+ skip=+\\'+ end=+'''+ keepend contains=pythonBytesError,pythonBytesContent,pythonDocTest,pythonSpaceError,@Spell
     syn region pythonBytes    start=+[bB]"""+ skip=+\\"+ end=+"""+ keepend contains=pythonBytesError,pythonBytesContent,pythonDocTest2,pythonSpaceError,@Spell