Partially fix GregorianCalendarTest.

ICU4C data (see icu4c/data/misc/supplementalData.txt)
as well as the RI agree that the minimum number of days
in the first week of the year should be 1 in canada.

(I'm not a 100% convinced that this is correct, the
canadian standards board claims to have implemented
ISO 8601, which requires a 4 day minimum. However, that
site links to several documents such as CSA Z234.5 that
are not publicly accessible).

(cherry picked from commit ce54057889055ab8c4cb45c51df0ca9ee09ebb43)

Change-Id: I7d152ba1f157bfaffeac6c38c37828aaf0004cb2
1 file changed