fix: always use tabs for formatting, ignore editor insertSpaces

src/main.lua

@@ -1805,11 +1805,10 @@ function handlers.textDocument_formatting(params)
 		return nil
 	end
 
-	local options = params.options or {}
 	local format_options = {
-		insertSpaces = options.insertSpaces,
+		insertSpaces = false,
-		tabSize = options.tabSize,
+		tabSize = 1,
-		indentSize = options.tabSize or 4,
+		indentSize = 1,
 	}
 
 	return formatter.format_document(doc.content, format_options)