Change decl_storage! to forbid default value for Option types (#3682)

* Forbid default values for Option types in decl_storage!

* fix test errors

* bump impl_version

substrate/node/runtime/src/lib.rs

@@ -85,7 +85,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
 	spec_version: 163,
-	impl_version: 163,
+	impl_version: 164,
 	apis: RUNTIME_API_VERSIONS,
 };