Change to use 10 frames in BordersTest

Change to use 10 frames only in BorderTest instead of 40 frames, to
reduce time needed for tests.

BUG=aomedia:506

Change-Id: Ia176eb3f643d007fa4d1c5fc182f16d3e7cdf700
diff --git a/test/borders_test.cc b/test/borders_test.cc
index 076f914..d4e8dea 100644
--- a/test/borders_test.cc
+++ b/test/borders_test.cc
@@ -59,7 +59,7 @@
   cfg_.rc_max_quantizer = 10;
 
   ::libaom_test::I420VideoSource video("hantro_odd.yuv", 208, 144, 30, 1, 0,
-                                       40);
+                                       10);
 
   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
 }
@@ -75,7 +75,7 @@
   cfg_.rc_min_quantizer = 40;
 
   ::libaom_test::I420VideoSource video("hantro_odd.yuv", 208, 144, 30, 1, 0,
-                                       40);
+                                       10);
 
   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
 }