Clean up & speed up Arena.tick

[Nul-led]

Why:

To improve tick speed

Summarize what's being changed (include any screenshots, code, or other media if available):

Removed unnecessary checks & added additional check for wether or not the arena has been reopened due to setTimeout

Confirm the following:

• [x] I have tested these changes (by compiling, running, and playing) and have seen no unintended differences in gameplay

[Nul-led]

Uhh okay, ill check again...