Don't change the cursor to a pointer when over a disabled image input.

layout/html/document/src/ua.css

@@ -548,6 +548,11 @@ input[type=image]:focus {
 input[type=image] {
   box-sizing: border-box;
   border: 2px solid blue;
+  cursor: pointer;
+}
+
+input[type=image][disabled] {
+  cursor: default;
 }
 
 input[type=file] {

layout/style/ua.css

@@ -548,6 +548,11 @@ input[type=image]:focus {
 input[type=image] {
   box-sizing: border-box;
   border: 2px solid blue;
+  cursor: pointer;
+}
+
+input[type=image][disabled] {
+  cursor: default;
 }
 
 input[type=file] {