fix: add flag char to avoid collision

Author: soridalac

src/commands/org/refresh/sandbox.ts

@@ -79,6 +79,7 @@ export default class RefreshSandbox extends SandboxCommandBase<SandboxCommandRes
       description: messages.getMessage('flags.source-id.description'),
       exclusive: ['source-sandbox-name'],
       length: 'both',
+      char: undefined,
     }),
     async: Flags.boolean({
       summary: messages.getMessage('flags.async.summary'),