test.mk: remove renamed file

vp90-2-15-fuzz-flicker.webm was renamed in:
c3db2d8 error check vp9 superframe parsing

Change-Id: I229dd6ca4c662802c457beea0f7b4128153a65dc
diff --git a/test/test.mk b/test/test.mk
index af344e5..e7c4036 100644
--- a/test/test.mk
+++ b/test/test.mk
@@ -758,8 +758,6 @@
 LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += vp90-2-15-segkey.webm.md5
 LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += vp90-2-15-segkey_adpq.webm
 LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += vp90-2-15-segkey_adpq.webm.md5
-LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += vp90-2-15-fuzz-flicker.webm
-LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += vp90-2-15-fuzz-flicker.webm.md5
 
 # Invalid files for testing libvpx error checking.
 LIBVPX_TEST_DATA-$(CONFIG_VP9_DECODER) += invalid-vp90-01.webm