ios-ane: revert to the device-verified bucket-64 chunk set (the bucket-512 set jetsams the on-device ANE first compile)

ios-ane/gemma4_e2b_hostcache_chunk3_int8.aimodel/main.hash

@@ -1 +1 @@
-ib�d��Wc���VG�.
9�(2��XQ���
+ ��fp�쁠\�C8OS�v����‘�q��

ios-ane/gemma4_e2b_hostcache_chunk3_int8.aimodel/main.mlirb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:6962ceab821364c9e75763829ab95647822e0f0139832832a7d658518c1be7c5
-size 327509158
+oid sha256:208daa66708bec81a0055cf743384f53900c7615fef98fa6c2917fde7110cfd6
+size 327509156