Set `Calendars.IS_PRIMARY` to `0` by default (#1945)

* Start setting `IS_PRIMARY`

Signed-off-by: Arnau Mora <arnyminerz@proton.me>

* Set `IS_PRIMARY` to `0`

* Remove unused injection

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

* Improve explanation

Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>

---------

Signed-off-by: Arnau Mora <arnyminerz@proton.me>
Signed-off-by: Arnau Mora Gras <arnyminerz@proton.me>