vsclib/setup.py: Change license information.

It it self-evident from the LICENSE file that this was intended to be
MPLv2 licensed and the setup.py script should reflect this.

(When it becomes part of vsc-tools, then this setup.py might even be
 superfluous and therefore removed)

vsclib/setup.py

@@ -30,7 +30,7 @@
     include_package_data=True,
     classifiers=[
         "Programming Language :: Python :: 3.10",
-        "License :: Other/Proprietary License",
+        "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)"
         "Operating System :: OS Independent",
     ],
     python_requires='>=3.7',