core: chroot: don't check for ChrootType membership

This check was added as part of the porting efforts where there was a
risk that chroot.__type might not be the right type.

It's broken on Python 3.10, and redundant so let's drop it.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

pmb/core/chroot.py

@@ -50,9 +50,6 @@ class Chroot:
             "riscv64",
         ]
 
-        if self.__type not in ChrootType:
-            raise ValueError(f"Invalid chroot type: '{self.__type}'")
-
         # A buildroot suffix must have a name matching one of alpines
         # architectures.
         if self.__type == ChrootType.BUILDROOT and self.__name not in valid_arches: