libxscrnsaver: bump version to 1.2.0

Signed-off-by: Joshua Lock <josh@linux.intel.com>

diff --git a/meta/packages/xorg-lib/libxscrnsaver_1.1.3.bb b/meta/packages/xorg-lib/libxscrnsaver_1.2.0.bb
similarity index 100%
rename from meta/packages/xorg-lib/libxscrnsaver_1.1.3.bb
rename to meta/packages/xorg-lib/libxscrnsaver_1.2.0.bb