Fix Debug Transaction command when Truffle config does not follow default name

[acuarica]

Whenever there is a Truffle workspace open that does not follow the default Truffle config file name, i.e., truffle-config.js,
the Truffle: Debug Transaction command fails with

ENOENT: no such file or directory, open '/[...]/truffle-config.js'

For example,

In this workspace, we have two Truffle config files, truffle-config.1.js and truffle-config.2.js. However, the after Debug Transaction command allows the user to select any of those, it fails with the aforementioned error.

Expected behavior

After the user selects any of those Truffle config files, the Debugger uses that selection to proceed with the debugging process.