Auto adjust size of tab available troops.

Hi Clashres...

In Smartphones, When using more than 7 different troops, castle, heroes and different spells, the number of troops to drop not fit on the screen, which in some cases causes errors to drop needed troops, making the attack does not come out as it should. One possible solution to this is that, when all the troops of 1 type is released, the box that troop disappears, and becomes smaller tab troops available, making the spell or so troops that were previously not shown appear without roll bar troops.