fix(native_lsp): boolean logic

[Yuhf7]

Fixes #523
The error seems to be due to boolean logic in native_lsp.lua:

-			bg = O.transparent_background and C.none
+			bg = O.transparent_background
+				or not inlay_hints.background and C.none

Since and has priority over or, Lua computes not inlay_hints.background and C.none first, and then O.transparent_background or'd with the result of and.
Then, if O.transparent_background is true (which is the case for me), the bg field is set to true, which causes the "invalid 'bg'" error.

Surrounding the or statement with parens seemed to solve the issue for me.

[mrtnvgr]

Thanks!