chore: add assetrefs to other games

src/ZoneCode/Game/IW3/XAssets/FxEffectDef.txt

@@ -36,6 +36,7 @@ set condition material FxElemDef::elemType == FX_ELEM_TYPE_SPRITE_BILLBOARD
 use FxEffectDefRef;
 set condition handle never;
 set string name;
+set assetref name ASSET_TYPE_FX;
 
 // FxTrailDef
 use FxTrailDef;

src/ZoneCode/Game/IW3/XAssets/WeaponDef.txt

@@ -8,6 +8,7 @@ set name szInternalName;
 set string szDisplayName;
 set string szOverlayName;
 set string szXAnims;
+set assetref szXAnims ASSET_TYPE_XANIMPARTS;
 set string szModeName;
 set scriptstring hideTags;
 set scriptstring notetrackSoundMapKeys;