[browser] fix advanced sample for MT (#83582)

Author: pavelsavara

src/mono/sample/wasm/browser-advanced/Wasm.Advanced.Sample.csproj

@@ -6,7 +6,7 @@
     <WasmEnableWebcil>true</WasmEnableWebcil>
     <WasmEmitSymbolMap>true</WasmEmitSymbolMap>
     <EmccEnableAssertions>true</EmccEnableAssertions>
-    <EmccEnvironment>web</EmccEnvironment>
+    <EmccEnvironment>web,worker</EmccEnvironment>
     <!-- add OpenGL emulation -->
     <EmccExtraLDFlags> -s USE_CLOSURE_COMPILER=1 -s LEGACY_GL_EMULATION=1 -lGL -lSDL -lidbfs.js</EmccExtraLDFlags>
     <!-- just to prove we don't do JS eval() -->