queues: Use full explicit JSON paths in generator

[sampsyo]

The queues compiler uses __file__ to locate JSON inputs relative to the Python script:

calyx/frontends/queues/queues/compile_queue.py

Lines 82 to 84 in bda80c0

	base_dir = os.path.dirname(__file__)
	json_subdir = "../tests/compiler/jsons"
	file_path = os.path.join(base_dir, json_subdir, json_file)

This can cause problems when the queues package is properly installed into a Python environment. Let's switch this entry point to instead take ordinary file paths: i.e., ones relative to cwd. This will require also updating the tests that use this generator, such as:

calyx/runt.toml

Line 120 in 85968c4

"frontends/queues/tests/compiler/*.py"