[config_tool] Board XML file name

[conghuic23]

Currently, it looks like the imported file name isn't based on the actual file name, but instead comes from the board name inside the XML file:

Example steps:

Using the Board Inspector, generate a board XML file called my_board,xml
Change the file name to my_potato.xml
Import the file into the Configurator
The Configurator imports the file as my_board.board.xml, not my_potato.board.xml