Un-hide correlation coefficient
better choice of shortcut

Change-Id: I85acd8a91de2d337d8619ba164dcd14d1939fac9
Reviewed-on: https://gerrit.libreoffice.org/28212Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>