Fix AOSP boot animation black screen issue.

Bug: 197740038
Test: Force stock android animation on a pixel phone in
BootAnimation.cpp. (Remember to disable dynamic coloring.) Check stock android animation.

Change-Id: I3c3979c344a351ec261bb12127cff971d6050367
diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index 7ed0bed..6eecc09 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -789,6 +789,8 @@
     // clear screen
     glDisable(GL_DITHER);
     glDisable(GL_SCISSOR_TEST);
+    glUseProgram(mImageShader);
+
     glClearColor(0,0,0,1);
     glClear(GL_COLOR_BUFFER_BIT);
     eglSwapBuffers(mDisplay, mSurface);