py/objexcept: Pretty print OSError also when it has 2 arguments.

This extends pretty-printing of OSError's to handle two arguments when the
exception name is known.

Signed-off-by: David Lechner <david@pybricks.com>

tests/basics/errno1.py

@@ -12,6 +12,10 @@ print(type(uerrno.EIO))
 # check that errors are rendered in a nice way
 msg = str(OSError(uerrno.EIO))
 print(msg[:7], msg[-5:])
+msg = str(OSError(uerrno.EIO, "details"))
+print(msg[:7], msg[-14:])
+msg = str(OSError(uerrno.EIO, "details", "more details"))
+print(msg[:1], msg[-28:])
 
 # check that unknown errno is still rendered
 print(str(OSError(9999)))

tests/basics/errno1.py.exp

@@ -1,4 +1,6 @@
 <class 'int'>
 [Errno  ] EIO
+[Errno  ] EIO: details
+( , 'details', 'more details')
 9999
 uerrno