remove potentially harmful LUA_PATH override

[bb010g]

i wrote this patch during the last time i was hacking on Alicorn, but hadn't submitted it then.

[AstroSnail]

I added a similar override to the flake check that runs all the lua tests in 2beba7e part of #100. It helps with test-pretty-print which, as currently written, requires both tap (which we pull in as a lit package in deps) and luaunit (which we pull in as part of the luajit package). Should this be changed?

[bb010g]

@AstroSnail I don't think setting the LUA_PATH like that is a good idea in general. I'd probably have a Lua module (//deps/init.lua?) that can be loaded that augments package.path & package.cpath as necessary, and figure out some way to require that early. luvit is a different Lua than luajit and should have its own equivalent to .withPackages to use.

[LunNova]

This was initially added in d176fbd
Should confirm dropping it hasn't broken runtest in dev shell / fix that if needed before merging.

[LunNova]

Running luvit runtest.lua and luajit runtest.lua in devShell for this doesn't immediately explode with a dep issue.

[AstroSnail]

i dug a bit deeper and found that it's related to the profiler fc7c860