WebGLBackend: Fix functions with struct layouts cannot resolve struct types (#32000)

src/renderers/webgl-fallback/nodes/GLSLNodeBuilder.js

@@ -1379,6 +1379,9 @@ ${shaderData.extensions}
 // precision
 ${ defaultPrecisions }
 
+// structs
+${shaderData.structs}
+
 // uniforms
 ${shaderData.uniforms}
 
@@ -1388,9 +1391,6 @@ ${shaderData.varyings}
 // codes
 ${shaderData.codes}
 
-// structs
-${shaderData.structs}
-
 void main() {
 
 	// vars