Fix warnings

Fix warnings

test_store.c: In function 'test_store':
test_store.c:258:3: warning: passing argument 2 of 'elm_store_fetch_func_set' from incompatible pointer type
../../src/lib/Elementary.h:27374:49: note: expected 'Elm_Store_Item_Fetch_Cb' but argument is of type 'void (*)(void *, struct Elm_Store_Item *)'
test_store.c:260:3: warning: passing argument 2 of 'elm_store_unfetch_func_set' from incompatible pointer type
../../src/lib/Elementary.h:27377:49: note: expected 'Elm_Store_Item_Unfetch_Cb' but argument is of type 'void (*)(void *, struct Elm_Store_Item *)'