[LyX/master] Fix stupid error in cc83dfa887.

[Richard Heck]

commit 5afe6cf9474e810e24e66f8361ce0276628b3c64
Author: Richard Heck <rgh...@lyx.org>
Date:   Fri Nov 13 17:03:40 2015 -0500

    Fix stupid error in cc83dfa887.

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index d24342c..f907d6c 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -1337,7 +1337,7 @@ string Buffer::getBackupName() const {
                backup.set(addName(fpath, addExtension(newbackname, fext)));
                v++;
        }
-       return v < 100 ? backup.onlyFileName() : "";
+       return v < 100 ? backup.absFileName() : "";
 }