Revert "tests/executor: set directory dep as editable"

This reverts commit 37b36f48 as this is no longer required.

tests/installation/test_executor.py

@@ -94,7 +94,6 @@ def test_execute_executes_a_batch_of_operations(
         .resolve()
         .resolve()
         .as_posix(),
         .as_posix(),
     )
     )
-    directory_package.develop = True
 
 
     git_package = Package(
     git_package = Package(
         "demo",
         "demo",