Fix LicenseWithExceptionSymbol missing Expression class variables

[arbassett-qnx]

LicenseWithExceptionSymbol class AND,OR,Symbol variables coming from expression were not being set during init this causes issues when using python operators like and when the symbol is only LicenseWithExceptionSymbol

ex.

l1 = spdx_licensing.parse("GPL-3.0-or-later WITH GCC-exception-3.1")
l2 = spdx_licensing.parse("MIT")
l3 = l1 & l2

This will cause an exception as AND is NONE

Traceback (most recent call last):
  File "test.py", line 19, in <module>
    l3 = l1 & l2
         ~~~^~~~
  File ".venv/lib/python3.12/site-packages/boolean/boolean.py", line 864, in __and__
    return self.AND(self, other)
           ^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not callable

The fix is a copy of BooleanAlgebra init which does the same but for all types