Closes #110, #96 - Fix level restriction

[DevSolaris]

Closes #110 - Closes #96
The current logic was checking if the gamemode is DISABLED in level, which led to it not detecting correct cases.
Tested with Level:

disabled-game-modes: []

with level under 10, was stopped correctly,
Tested with Level:

disabled-game-modes: 
  - BSkyBlock

with level under 10, was led through correctly.

[tastybento]

Thanks!