community/tree-sitter: set current directory as header path

Should fix issues with some tree-sitter grammars failing to load. Related: !54521 (closed)

EDIT: I will try to fix as many grammars as possible in this pr, so at the very least if they work correctly when built via helix, they should work correctly in aports. Note: I am not a clang developer, nor am I familiar with the toolchains surrounding it, so please keep that in mind.

grammar	pre-mr	helix (23.05)	post-mr
bash	✅	✅	✅
c	❌	✅	✅
c-sharp	❗	❗	❗
cmake	❗	❗	❗
comment
cpp	❌	❌	❌
css	❗	❗	❗
elixir	✅	✅	✅
elm	✅	✅	✅
embedded-template
git-commit
git-diff
git-rebase
go	✅	✅	✅
go-mod	✅	✅	✅
hare	✅	✅	✅
hcl
html	❗	❗	❗
ini
java	❗	❌	✅
javascript	❌	❌	✅
jsdoc
json	❗	❗	❗
julia	❗	❗	❗
kotlin	✅	❌	✅
latex
lua	✅	❌	✅
python	❌	✅	✅
regex
ruby	✅	✅	✅
rust	❌	✅	✅
scala	✅	❌	✅
ssh-client-config
toml	❗	❗	❗
tsq
typescript	❗	❌	❗

❌ : No highlights in helix and error is thrown in logs

❗ : No/Partial highlights in helix but error is not thrown in logs

✅ : Highlights work and no errors are thrown in logs

If anyone has any ideas on how to automate these tests, that would be appreciated.