Update block examples to use default

Author: edanzer

projects/packages/forms/src/blocks/field-slider/index.js

@@ -33,7 +33,7 @@ const settings = {
 				attributes: {
 					min: 0,
 					max: 100,
-					value: 50,
+					default: 50,
 				},
 			},
 		],

projects/packages/forms/src/blocks/input-range/index.js

@@ -34,7 +34,7 @@ const settings = {
 		attributes: {
 			min: 0,
 			max: 100,
-			value: 50,
+			default: 50,
 		},
 	},
 };