Remove odd character from test text

/Users/mnunberg/Source/libcouchbase/tests/basic/t_connstr.cc:253:51:
warning: illegal character encoding in string literal
[-Winvalid-source-encoding]
    ASSERT_EQ(LCB_SUCCESS, err) << "Ok with bucket<CA>and no hosts";

Change-Id: Ia5afb5f72d178ccf3daf23c00a083009585b0af9
Reviewed-on: http://review.couchbase.org/40985
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>