sadf: ppc: Remove duplicate % sign

sadf: ppc: Remove duplicate % sign

In some cases, the % sign was printed twice by sadf -p, e.g.:

$ sadf -p test_file
test.home	1	2017-12-24 14:52:39 UTC	all	%%user	0.25
test.home	1	2017-12-24 14:52:39 UTC	all	%%nice	0.00
test.home	1	2017-12-24 14:52:39 UTC	all	%%system	0.25
test.home	1	2017-12-24 14:52:39 UTC	all	%%iowait	0.00
test.home	1	2017-12-24 14:52:39 UTC	all	%%steal	0.00
test.home	1	2017-12-24 14:52:39 UTC	all	%%idle	99.50

Expected result:

$ sadf -p test_file
test.home	1	2017-12-24 14:52:39 UTC	all	%user	0.25
test.home	1	2017-12-24 14:52:39 UTC	all	%nice	0.00
test.home	1	2017-12-24 14:52:39 UTC	all	%system	0.25
test.home	1	2017-12-24 14:52:39 UTC	all	%iowait	0.00
test.home	1	2017-12-24 14:52:39 UTC	all	%steal	0.00
test.home	1	2017-12-24 14:52:39 UTC	all	%idle	99.50

Problem was triggered by commit 5431b6c.
This patch fixes it.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>