frappy.client.interactive: no pathlib needed here

allow the argument of the run function to be a simple string

Change-Id: I1d5de3802b6adc22a01a262d4cb017bf7dd084c5
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/36343
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>

frappy/client/interactive.py

@@ -449,7 +449,7 @@ def run(filepath):
         "__file__": filepath,
         "__name__": "__main__",
     })
-    with filepath.open('rb') as file:
+    with open(filepath, 'rb') as file:
         # pylint: disable=exec-used
         exec(compile(file.read(), filepath, 'exec'), clientenv.namespace, None)