inline hints causes rust_tools to throw on every keypress

[alechp]

Example of issue:

Upstream issue fix:

https://github.com/simrat39/rust-tools.nvim/issues/300

Possibly result of adding inline_hints here:

https://github.com/alechp/bloated-lvim/commit/6dac199a6a2de487eed1f408f1c156ef271e934f

Will submit PR for this soon:

[abzcoding]

fixed via #106