test-merge5: removed unnecessary parts of test
- no need to initialize a new directory
- no need to fix the commit time, already done by run-tests
- no need to exit 0, use exit code from hg instead
- better spacing around comments
$ echo '[Section]' >> $HGRCPATH
$ echo 'KeY = Case Sensitive' >> $HGRCPATH
$ echo 'key = lower case' >> $HGRCPATH
$ hg showconfig Section
Section.KeY=Case Sensitive
Section.key=lower case