Remove dead-code

`EXPORT_ES6 && !MODULARIZE` is never a valid combination.

src/shell.js

@@ -133,9 +133,6 @@ var ENVIRONMENT_IS_WASM_WORKER = Module['$ww'];
 #if SHARED_MEMORY && !MODULARIZE
 // In MODULARIZE mode _scriptDir needs to be captured already at the very top of the page immediately when the page is parsed, so it is generated there
 // before the page load. In non-MODULARIZE modes generate it here.
-#if EXPORT_ES6
-var _scriptDir = import.meta.url;
-#else
 var _scriptDir = (typeof document != 'undefined' && document.currentScript) ? document.currentScript.src : undefined;
 
 if (ENVIRONMENT_IS_WORKER) {
@@ -146,8 +143,7 @@ else if (ENVIRONMENT_IS_NODE) {
   _scriptDir = __filename;
 }
 #endif // ENVIRONMENT_MAY_BE_NODE
-#endif
-#endif
+#endif // SHARED_MEMORY && !MODULARIZE
 
 // `/` should be present at the end if `scriptDirectory` is not empty
 var scriptDirectory = '';