Fix oddly reverted upstream change

Author: prushforth

src/mapml/utils/Util.js

@@ -680,7 +680,7 @@ export const Util = {
         text.slice(-14) === '</map-feature>'
       ) {
         let layer =
-          `<layer- label="${mapEl.locale.dfPastedLayer}" checked>
+          `<map-layer label="${mapEl.locale.dfPastedLayer}" checked>
                        <map-meta name='projection' content='${mapEl.projection}'></map-meta>` +
           text +
           '</map-layer>';