Use ST_OAM constants for OamData definitions

src/mirage_tower.c

@@ -139,10 +139,10 @@ static const union AnimCmd gSpriteAnim_8617DEC[] =
 static const struct OamData gOamData_8617DF4 =
 {
     .y = 0,
-    .affineMode = 0,
-    .objMode = 0,
+    .affineMode = ST_OAM_AFFINE_OFF,
+    .objMode = ST_OAM_OBJ_NORMAL,
     .mosaic = 0,
-    .bpp = 0,
+    .bpp = ST_OAM_4BPP,
     .shape = SPRITE_SHAPE(16x16),
     .x = 0,
     .matrixNum = 0,