Remove radial-gradient test from XFAIL list

This test has not been failing since the fix in:

	772edc9133

So get rid of the '1 unexpected passes' complaint.

test/Makefile.am

@@ -409,7 +409,6 @@ extend-pad			\
 filter-nearest-offset		\
 ft-text-vertical-layout-type1	\
 long-lines			\
-radial-gradient			\
 self-intersecting		\
 surface-pattern			\
 surface-pattern-scale-down	\

test/radial-gradient.c

@@ -36,8 +36,7 @@ static cairo_test_draw_function_t draw;
 
 cairo_test_t test = {
     "radial-gradient",
-    "Simple test of radial gradients"
-    "\nCurrently failing EXTEND_REFLECT with non-zero inner radius for SVG backend",
+    "Simple test of radial gradients",
     WIDTH, HEIGHT,
     draw
 };