[clang-tools-extra] [clangd] Fix parens suppression in mid-identifier code-completion (PR #197249)

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argothiel wrote:

> fact is that it is still default behaviour in for example vscode

@timon-ul I think that's the backward compatibility lock-in. Given the `replace` mode is new and usually implemented after the `insert` mode, the editor developers don't want to surprise users with a change of behavior. I have the same issue with Neovim now. I want to implement the `replace` mode in Neovim and I would gladly change the default to `replace` when implemented, but I don't think that's warranted. Changing the mode could be a breaking change for some users, so probably `insert` will remain the default there too, just like it is in VS Code.

https://github.com/llvm/llvm-project/pull/197249