fix: validation (better #8456) (#8461)

* Revert "revert 484e023c0"

This reverts commit c03b70c949.

* also allow pure renote

* fix checks for pure renote

packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts

@@ -48,7 +48,11 @@ export const paramDef = {
 		includeMyRenotes: { type: 'boolean', default: true },
 		includeRenotedMyNotes: { type: 'boolean', default: true },
 		includeLocalRenotes: { type: 'boolean', default: true },
-		withFiles: { type: 'boolean' },
+		withFiles: {
+			type: 'boolean',
+			default: false,
+			description: 'Only show notes that have attached files.',
+		},
 	},
 	required: [],
 } as const;