fix: make semantic changes to commands

* add missing __main__ call to commands.py
* remove unnecessary imports
* fix backup WITH_FILES logic
* follow python semantics (?)

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

build/common/commands/worker.py

@@ -1,10 +1,12 @@
-import os, frappe
+import os
 from frappe.utils.background_jobs import start_worker
 
+
 def main():
     queue = os.environ.get("WORKER_TYPE", "default")
     start_worker(queue, False)
     exit(0)
 
+
 if __name__ == "__main__":
     main()