items: fix TR1 item underwater SFX test

This restores the TR1 behaviour of checking if the item is underwater
to determine the SFX play mode of anim commands. TR2 only plays
underwater SFX for specific object types.

src/libtrx/game/items.c

@@ -233,13 +233,15 @@ void Item_PlayAnimSFX(
     }
 
     const ITEM *const lara_item = Lara_GetItem();
+    const bool item_underwater =
+        (Room_Get(item->room_num)->flags & RF_UNDERWATER) != 0;
     const ANIM_COMMAND_ENVIRONMENT mode = data->environment;
 
     if (mode != ACE_ALL && item->room_num != NO_ROOM) {
         int32_t height = NO_HEIGHT;
         if (item == lara_item) {
             height = Lara_GetLaraInfo()->water_surface_dist;
-        } else if (Room_Get(item->room_num)->flags & RF_UNDERWATER) {
+        } else if (item_underwater) {
             height = -STEP_L;
         }
 
@@ -252,7 +254,9 @@ void Item_PlayAnimSFX(
     SOUND_PLAY_MODE play_mode = SPM_NORMAL;
     if (item == lara_item) {
         play_mode = SPM_ALWAYS;
-    } else if (Object_IsObjectType(item->object_id, g_WaterObjects)) {
+    } else if (
+        Object_IsObjectType(item->object_id, g_WaterObjects)
+        || (TR_VERSION == 1 && item_underwater)) {
         play_mode = SPM_UNDERWATER;
     }
 #if TR_VERSION > 1