Enable testcase for BUG#49129

mysql-test/suite/optimizer_unfixed_bugs/r/bug49129.result

@@ -26,9 +26,9 @@ a
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+SET SESSION optimizer_switch = 'semijoin=off';
 
 # This result is correct
-SET SESSION optimizer_switch = 'semijoin=off';
 SELECT * FROM t0 WHERE t0.a IN 
 (SELECT t1.a FROM t1, t2 WHERE t2.a=t0.a AND t1.b=t2.b);
 a

mysql-test/suite/optimizer_unfixed_bugs/t/disabled.def

 # Disabling all subquery problems
 
-bug49129             : Wrong result with IN-subquery with join_cache_level=6 and firstmatch=off
 bug45221             : Query "SELECT pk FROM C WHERE pk IN (SELECT # int_key)" failing
 bug45219             : Azalea crash on query containing a JOIN in subquery