chore: fix up completions keybind and rust analyzer settings

lua/plugins/lsp.lua

@@ -191,6 +191,12 @@ return {
       vim.lsp.config("rust_analyzer", {
         settings = {
           ["rust-analyzer"] = {
+            files = {
+              watcher = "server",
+            },
+            check = {
+              command = "clippy",
+            },
             diagnostics = {
               enable = false,
             },