[BUG] Auto-reload Fails When Script Is Run Outside Its Directory

Auto-reloading does not function properly if the application is run from a directory other than the one containing the script.

**Steps to Reproduce:**
1. Run a Tkinter application using `tkreload example/sample_app.py` from a directory outside `example`.
- **Result:** The application launches successfully, and manual reload works, but auto-reload does not.
2. Change to the script's directory (`cd example`) and run `tkreload sample_app.py`.
- **Result:** Auto-reload works as expected.

**Expected Behavior:**
Auto-reloading should work regardless of the current working directory when the script is executed.

**Actual Behavior:**
Auto-reload only works if the script is run from its containing directory.

This issue may be related to how file paths are resolved during auto-reload.