Add one more paint test

Add a test for the clip_box_top_left_glyph,
since we've seen broken rendering with it.

test/api/results/test-154

@@ -0,0 +1,30 @@
+# random seed: R02S44305390d95bd0132defe151ebe3a9a6
+# Start of hb tests
+# Start of paint tests
+# Start of ot tests
+start clip rectangle 0 500 500 1e+03
+  start transform 1 0 0 1 0 0
+    start transform 1 0 -0 1 0 0
+      start clip glyph 2
+        start transform 1 0 0 1 0 0
+          radial gradient
+            p0 166 768 radius 0
+            p1 166 768 radius 256
+            colors
+              0 0 128 0 255
+              0.5 255 255 255 255
+              1 255 0 0 255
+        end transform
+      end clip
+    end transform
+    push group
+      start transform 1 0 -0 1 0 0
+        start clip glyph 159
+          start transform 1 0 0 1 0 0
+            solid 128 128 128 102
+          end transform
+        end clip
+      end transform
+    pop group mode 3
+  end transform
+end clip

test/api/test-paint.c

@@ -323,6 +323,7 @@ static paint_test_t paint_tests[] = {
   { TEST_GLYPHS, 0,  106,   0, "test-106" },
   { TEST_GLYPHS, 0,  116,   0, "test-116" }, // compositing
   { TEST_GLYPHS, 0,  123,   0, "test-123" },
+  { TEST_GLYPHS, 0,  154,   0, "test-154" },
   { TEST_GLYPHS, 0,  165,   0, "test-165" }, // linear gradient
   { TEST_GLYPHS, 0,  175,   0, "test-175" }, // layers
   { BAD_COLRV1,  0,  154,   0, "bad-154" },  // recursion