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/background.py

@@ -1,10 +1,11 @@
-import frappe
 from frappe.utils.scheduler import start_scheduler
 
+
 def main():
     print("Starting background scheduler . . .")
     start_scheduler()
     exit(0)
 
+
 if __name__ == "__main__":
     main()