test/meson.build is outdated

Since I’ve discovered you now provide meson for building, I’m switching Arch packages to it but I’ve encountered an issue:

jami-daemon/test/meson.build:59:0: ERROR: File unitTest/channel/testChannel.cpp does not exist.

The file seems to be gone a while ago, but test/meson.build wasn’t updated accordingly. For now, I will just keep tests disabled (they were already, but I thought redoing the package would be a good opportunity to enable them).