build-system/qt: Fix wrapping with QTWEBENGINEPROCESS_PATH.

This is a follow up commit to 06eb21856f, which added QTWEBENGINEPROCESS_PATH
to the list of wrapped variables.  Unfortunately it wouldn't be set, as its
value is a plain file rather than a directory, and the code only checked for
directories.

* guix/build/qt-build-system.scm (variables-for-wrapping): Define a file type
entry for each variable definition, and use it to determine if we should look
for directories versus plain files.

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