Fix scriptlets not being reported in logger (Firefox)

Regression from:
- efe2e0c78a

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/2072

src/js/messaging.js

@@ -658,7 +658,7 @@ const retrieveContentScriptParameters = async function(sender, request) {
         µb.canInjectScriptletsNow === false ||
         isNetworkURI(sender.frameURL) === false
     ) {
-        response.scriptlets = scriptletFilteringEngine.retrieve(request);
+        scriptletFilteringEngine.injectNow(request);
     }
 
     // https://github.com/NanoMeow/QuickReports/issues/6#issuecomment-414516623

src/js/scriptlet-filtering.js

@@ -118,7 +118,7 @@ const contentscriptCode = (( ) => {
             '"', 'hostname-slot', '", ',
             '"', 'scriptlets-slot', '"',
         ');',
-        '0;',
+        '\n0;',
     ];
     return {
         parts: parts,