Reduce Memory. RAM 6924->7248, unused:524->1004

Before:
Size: 66 KiB (22 KiB resources, 17 KiB binary) Available RAM: 6924 / 24576 bytes (28%)
Heap Usage for <Timely>: Available <6048B> Used <5524B> Still allocated <112B>

Date formatting removed from case to array
Size: 66 KiB (22 KiB resources, 17 KiB binary) Available RAM: 7028 / 24576 bytes (29%)
Heap Usage for <Timely>: Available <6308B> Used <5524B> Still allocated <112B>

Setting up layers with: set_layer_attr_sfont
Size: 65 KiB (22 KiB resources, 17 KiB binary) Available RAM: 7248 / 24576 bytes (29%)
Heap Usage for <Timely>: Available <6528B> Used <5524B> Still allocated <112B>
Merge pull request #3 from ron064/watchface

[Thanks Ron!]  Reduce Memory.