Observe quiet field in configuration file

Previously, the `quiet` field in the configuration file would be
ignored by the CLI, only the `--quiet` command-line flag would
work. Now, both work.

Note that `DCLinter` does not observe the `quiet` configuration field.

src/cli/cli.ts

@@ -109,7 +109,7 @@ async function main() {
 
   let lintResults = await linter.lintFiles(cliArguments.files, cliArguments.recursive);
 
-  if (cliArguments.quiet) {
+  if (config.quiet) {
     lintResults = lintResults
       .map((result) => ({
         ...result,