Corrected writing I;16 text

Author: radarhere

Tests/test_imagefont.py

@@ -141,7 +141,9 @@ def test_I16(font):
     draw = ImageDraw.Draw(im)
 
     txt = "Hello World!"
-    draw.text((10, 10), txt, font=font)
+    draw.text((10, 10), txt, fill=0xFFFE, font=font)
+
+    assert im.getpixel((12, 14)) == 0xFFFE
 
     target = "Tests/images/transparent_background_text_L.png"
     assert_image_similar_tofile(im.convert("L"), target, 0.01)

src/libImaging/Paste.c

@@ -425,7 +425,7 @@ fill_mask_L(
                 *out = BLEND(*mask, *out, ink[0], tmp1);
                 if (strncmp(imOut->mode, "I;16", 4) == 0) {
                     out++;
-                    *out = BLEND(*mask, *out, ink[0], tmp1);
+                    *out = BLEND(*mask, *out, ink[1], tmp1);
                 }
                 out++, mask++;
             }