remove pdb code from CLI example (bytecodealliance#154)

I hadn't meant to check that in earlier; it was intended only for a local
experiment.

Signed-off-by: Joel Dice <[email protected]>

Author: dicej

examples/cli/app.py

@@ -1,9 +1,5 @@
 from wit_world import exports
-from wit_world.imports.environment import get_arguments
-import pdb
 
 class Run(exports.Run):
     def run(self) -> None:
-        if "--pdb" in get_arguments():
-            pdb.set_trace()
         print("Hello, world!")