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_chunk5_int8.aimodel/main.hash

@@ -1 +1 @@
-ǨJ��jG�"�Y@B���l]�nL��G'#&���
+�xZ[�c}�NĬE�]mMt#�������d(

ios-ane/gemma4_e2b_hostcache_chunk5_int8.aimodel/main.mlirb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c7a84acec4046a47d122b65940428695f76c5df16e4cd4d4472723269996b013
-size 327509033
+oid sha256:8f785a5bf0630f7d1da04ec4ac1f45fc5d6d1d4d7423e3ccf4c0b8139edd6428
+size 327509043