Fix Maexxna's portal rotation. (#925)

* Maexxna portal rotation.

* Rewritten sql to update, ready to be merged.

* Portal's visual effect should be in different phasemask and appear only when maexxna is killed.

* split the update query in two, forgot that visual is in phase2

* i want to kms.. all should be good now

data/sql/updates/pending_db_world/rev_1528849180165830100.sql

@@ -0,0 +1,21 @@
+INSERT INTO version_db_world (`sql_rev`) VALUES ('1528849180165830100');
+
+
+-- proper coords: 
+-- 3465.16, -3940.45, 308.788, 0.441179, -0.305481, 0.637715, 0.305481, 0.637716,
+-- requires two guids, one for the 'visual effect' and one for the 
+-- teleporter gameobject itself
+
+-- teleporter itself
+UPDATE `gameobject` SET
+    `spawnmask` = 3, `phasemask`= 1,
+    `position_x` = 3465.16, `position_y` = -3940.45, `position_z` = 308.788,`orientation` = 0.441179, 
+    `rotation0` = -0.305481, `rotation1` = 0.637715, `rotation2` = 0.305481, `rotation3` = 0.637716
+    where `guid` = 65857; -- check if guid is valid
+
+-- visual effect
+UPDATE `gameobject` SET
+    `spawnmask` = 3, `phasemask`= 2,
+    `position_x` = 3465.16, `position_y` = -3940.45, `position_z` = 308.788,`orientation` = 0.441179, 
+    `rotation0` = -0.305481, `rotation1` = 0.637715, `rotation2` = 0.305481, `rotation3` = 0.637716
+    WHERE `guid` = 268045; -- check if guid is valid