xfstests: fix incorrect redirect in generic/233

generic/233 attempts to direct output to tee, but instead of using a
pipe it uses an append operator. Hence it leaves a file named "tee"
in the root directory of the xfstests execution path. Just direct
the output to the $seqres.full file rather than trying to tee it
into the test output as well.

Reported-by: "Michael L. Semon" <mlsemon35@gmail.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>

tests/generic/233

@@ -62,7 +62,7 @@ _fsstress()
 -f rename=10 -f fsync=2 -f write=15 -f dwrite=15 \
 -n $count -d $out -p 7`
 
-	echo "fsstress $args" >> tee -a $seqres.full
+	echo "fsstress $args" >> $seqres.full
 	if ! su $qa_user -c "$FSSTRESS_PROG $args" | tee -a $seqres.full | _filter_num
 	then
 		echo "    fsstress $args returned $?"