tests: Don't use g_test_verbose() as cogl doesn't use GTest anymore

But use cogl_test_verbose() instead.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 77efc7428d9ad18c2db1e3fdb544efa091249eaf)

tests/conform/test-read-texture-formats.c

@@ -196,6 +196,6 @@ test_read_texture_formats (void)
 
   cogl_object_unref (tex_2d);
 
-  if (g_test_verbose ())
+  if (cogl_test_verbose ())
     g_print ("OK\n");
 }

tests/conform/test-write-texture-formats.c

@@ -182,6 +182,6 @@ test_write_texture_formats (void)
                   2, 0xff, 10, 0x56, 10, 0x34, 10, 0x12,
                   -1);
 
-  if (g_test_verbose ())
+  if (cogl_test_verbose ())
     g_print ("OK\n");
 }