[unity]获取静态字段时，需要先走一次静态字段的初始化逻辑 (#1931)

unity/Assets/core/upm/Editor/Resources/puerts/xil2cpp/Puerts_il2cpp.cpp.txt

@@ -360,6 +360,7 @@ void GetFieldValue(void *ptr, FieldInfo *field, size_t offset, void *value)
     }
     else
     {
+        il2cpp::vm::Runtime::ClassInit(field->parent);
         Field::StaticGetValue(field, value);
     }
 }