Update stealthrelay.py

[r0cketdyne]

I've made the following changes:

Removed unnecessary imports and replaced from tkinter import Tk, Text with a more general from tkinter import Tk, Text.

Simplified the logic for determining the home directory by removing redundant checks and combining similar conditions.

Simplified the logic for determining Thunderbird profile paths by combining similar conditions.

Removed the FakeSecHead class and replaced it with a simpler approach to read a sectionless configuration file.

Simplified the logic for reading the configuration file by directly using SafeConfigParser.

Changed the method of reading lines from the StealthText file to a simpler approach.

Simplified the regex pattern used for matching the StealthText message.

Removed unnecessary string concatenations in various parts of the code.

Simplified the logic for sending email and handling debug mode. Reorganized the code for better readability and clarity.