LibJS: Replace usages of JS_{DECLARE, DEFINE}_NATIVE_GETTER

These macros are equivalent to JS_{DECLARE, DEFINE}_NATIVE_FUNCTION and
were only sometimes used, so let's just get rid of them altogether.

Userland/Libraries/LibJS/Runtime/PromiseConstructor.h

@@ -31,7 +31,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(reject);
     JS_DECLARE_NATIVE_FUNCTION(resolve);
 
-    JS_DECLARE_NATIVE_GETTER(symbol_species_getter);
+    JS_DECLARE_NATIVE_FUNCTION(symbol_species_getter);
 };
 
 }