gnucash maint: [aqbanking] Keep transaction purpose conversion

[Christian Stimming]

Updated	 via  https://github.com/Gnucash/gnucash/commit/50e59077 (commit)
	from  https://github.com/Gnucash/gnucash/commit/ec5b1109 (commit)



commit 50e59077d7160ba2d9eb1cb587c3b0c5597fee31
Author: Christian Stimming <christian at cstimming.de>
Date:   Sun Sep 15 22:15:58 2019 +0200

    [aqbanking] Keep transaction purpose conversion
    
    With the newest (beta) aqbanking versions there is a renamed
    version of the previous getter of the txn purpose available, which
    had been switched to a different semantic in between.



Summary of changes:
 gnucash/import-export/aqb/gnc-ab-utils.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)