gst-input-selector-switch.py: use a better pattern for the second source

Having a pattern which notably changes in time makes it clearer that
sources keep playing even when they are not active.

diff --git a/python/gst-input-selector-switch.py b/python/gst-input-selector-switch.py
index 31b93d0..4f622c6 100755 (executable)
--- a/python/gst-input-selector-switch.py
+++ b/python/gst-input-selector-switch.py
@@ -14,7 +14,7 @@ GObject.threads_init()
 # The following pipeline works
 PIPELINE = """
 videotestsrc pattern=0 ! selector.
-videotestsrc pattern=13 ! selector.
+videotestsrc pattern=18 background-color=4294901760 ! selector.
 input-selector name=selector ! autovideosink
 """