Use constants for Oam .shape and .size fields

Also some general formatting fixes for constants.

src/battle_pyramid_bag.c

@@ -282,10 +282,10 @@ static const struct OamData gOamData_861F378 =
     .objMode = 0,
     .mosaic = 0,
     .bpp = 0,
-    .shape = 0,
+    .shape = SPRITE_SHAPE(64x64),
     .x = 0,
     .matrixNum = 0,
-    .size = 3,
+    .size = SPRITE_SIZE(64x64),
     .tileNum = 0,
     .priority = 1,
     .paletteNum = 0,