Addressed code review comment

Author: bmingles

plugins/python-remote-file-source/src/deephaven/python_remote_file_source/plugin_object.py

@@ -116,7 +116,7 @@ def set_execution_context(
 
         # Convert dict to set
         if isinstance(top_level_module_fullnames, dict):
-            top_level_module_fullnames = set(top_level_module_fullnames.keys())
+            top_level_module_fullnames = set(top_level_module_fullnames)
 
         # Evict cached modules
         # 1. Any matching the old configuration to ensure remote sources from