[fix] Exit codes: return 4 when Duniter is not running

app/lib/common-libs/exit-codes.ts

@@ -2,8 +2,8 @@ export enum ExitCodes {
   OK = 0,
   UNHANDLED_ERROR = 1,
   UNCAUGHT_EXCEPTION = 2,
-  DUNITER_NOT_RUNNING = 2,
   SIGINT = 3,
+  DUNITER_NOT_RUNNING = 4,
   SYNC_FAIL = 50,
   FORCE_CLOSE_AFTER_ERROR = 100,
   MINDEX_WRITING_ERROR = 500,