no CSS maps when inline

Co-authored-by: Jason Miller <developit@users.noreply.github.com>

Author: stipsan

src/index.js

@@ -447,7 +447,7 @@ function createConfig(options, entry, format, writeMeta) {
 						inject: false,
 						extract: options.css !== 'inline',
 						minimize: options.compress,
-						sourceMap: options.sourcemap,
+						sourceMap: options.sourcemap && options.css !== 'inline',
 					}),
 					moduleAliases.length > 0 &&
 						alias({