Consistent cull_box struct usage (#2905)

* consistent cullbox usage

* d_a_obj_waterPillar debug work so its not a regression

include/d/actor/d_a_obj_pdtile.h

@@ -58,7 +58,7 @@ private:
     /* 0x7BC */ char* mArcName;
     /* 0x7C0 */ u32 mDzbId;
     /* 0x7C4 */ u32 mBmdId;
-    /* 0x7C8 */ Vec* mCullBox;
+    /* 0x7C8 */ cull_box* mCullBox;
     /* 0x7CC */ f32 field_0x7cc;
     /* 0x7D0 */ u8 field_0x7d0;
     /* 0x7D4 */ int field_0x7d4;

include/d/actor/d_a_obj_waterPillar.h

@@ -119,7 +119,7 @@ private:
         return shape_angle.x & 0xFF;
     }
 
-    s32 getParam(u8 shift, u8 bit) {
+    s32 getParam(int shift, int bit) {
         return fopAcM_GetParamBit(this, shift, bit);
     }