Deletes a value from a standard format .ini file.
IniDelete Filename, Section , Key
The name of the .ini file, which is assumed to be in A_WorkingDir if an absolute path isn't specified.
The section name in the .ini file, which is the heading phrase that appears in square brackets (do not include the brackets in this parameter).
The key name in the .ini file. If omitted, the entire Section will be deleted.
An exception is thrown on failure.
A standard ini file looks like:
IniRead, IniWrite, RegDelete, RegDeleteKey
IniDelete "C:\Temp\myfile.ini", "section2", "key"