abrt-cli status: fix the output

Before:
ABRT has detected '2' problem(s). (For more info run: $ abrt-cli list --since 1372083129 )
After:
ABRT has detected 2 problem(s). For more info run: abrt-cli list --since 1372083129

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>