Robustify Eglot for "transient" projects

When Eglot needs to synthesize a "transient" project for
default-directory sometimes the value of that variable is set to an
unexpanded value, sometimes not.  This can cause simple invocations
like.

   Emacs -Q ~/path/to-some-python-file.py -f eglot

to fail, because eglot--current-server will be looking for a project
in the registry called

    (transient . "~/path")

where in reality it is stored there as

    (transient . "/home/someuser/path")

The fix is to always expand default-directory in eglot--current-project.

* lisp/progmodes/eglot.el (eglot--current-project): Use
expand-file-name.

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