wasm: fix passing environmental variables

Task-number: QTBUG-75530
Change-Id: Ic0f0bd8ce863f55d737d96bbf9e5473466381c9b
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/plugins/platforms/wasm/qtloader.js

@@ -404,7 +404,7 @@ function QtLoader(config)
         Module.preRun = Module.preRun || []
         Module.preRun.push(function() {
             for (var [key, value] of Object.entries(config.environment)) {
-                Module.ENV[key.toUpperCase()] = value;
+                ENV[key.toUpperCase()] = value;
             }
         });