Fixed default value of `open-junk-file-directory'.
Fixed default value of `open-junk-file-directory'.

This variable does NOT specify the directory portion for the junk file
creation; it is an alias for `open-junk-file-format'. Hence, it should
contain format markers for the randomisation of the junk file name.

The previous value would not auto-generate a junk name for the junk
file: the prompt would ask for a file extension without having an
auto-generated junk file name.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs