Fix precip interpolation

See: https://git.do.srb2.org/STJr/SRB2/-/commit/6c54af377481a42f639da2db6cefe33d02918bce

src/p_mobj.c

@@ -3792,12 +3792,11 @@ void P_NullPrecipThinker(precipmobj_t *mobj)
 {
 	//(void)mobj;
 	mobj->precipflags &= ~PCF_THUNK;
+	R_ResetPrecipitationMobjInterpolationState(mobj);
 }
 
 void P_SnowThinker(precipmobj_t *mobj)
 {
-	R_ResetPrecipitationMobjInterpolationState(mobj);
-
 	P_CycleStateAnimation((mobj_t *)mobj);
 
 	// adjust height
@@ -3810,8 +3809,6 @@ void P_SnowThinker(precipmobj_t *mobj)
 
 void P_RainThinker(precipmobj_t *mobj)
 {
-	R_ResetPrecipitationMobjInterpolationState(mobj);
-
 	P_CycleStateAnimation((mobj_t *)mobj);
 
 	if (mobj->state != &states[S_RAIN1])