Fix canadian french keyboard mappings

While checking the Canadian French layout, I noticed that there
are 2 keys that are not producing the expected character. This CL
while change the mapping for AltGr+comma to "macron", and
AltGr+dot to "soft hyphen", which will match the behavior of other
OS.

Bug: 341776229
Test: Flashed on device, tested by switching to Canadian French
Flag: EXEMPT resources only
Change-Id: Ic6c06328f1c4c0c9a81270b39ffd1193bd9487f5