backend-common: fix config schema using address rather than host

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/smart-mangos-fly.md

@@ -0,0 +1,5 @@
+---
+'@backstage/backend-common': patch
+---
+
+Fixed configuration schema incorrectly declaring `backend.listen.address` to exist, rather than `backend.listen.host`, which is the correct key.

packages/backend-common/config.d.ts

@@ -41,7 +41,7 @@ export interface Config {
       | string
       | {
           /** Address of the interface that the backend should bind to. */
-          address?: string;
+          host?: string;
           /** Port that the backend should listen to. */
           port?: string | number;
         };