Neovim: Await promises

[AndreasArvidsson]

Decide if these promises should be awaited

cursorless/packages/cursorless-neovim/src/registerCommands.ts

Line 31 in fc824af

void modeSwitchNormalTerminal(client);

cursorless/packages/cursorless-neovim/src/registerCommands.ts

Line 52 in fc824af

void modeSwitchTerminal(client);