Wait forever until the lock file can be locked

Summary:
- `timeout = 3000` is a bit short on some computer. Use `timeout = -1` will work for any case.

BUG: 401041

Test Plan: BUG: 401041 is fixed on my computer.

Reviewers: mvourlakos, #latte_dock

Reviewed By: mvourlakos

Tags: #latte_dock, #plasma

Differential Revision: https://phabricator.kde.org/D18258

app/main.cpp

@@ -190,7 +190,7 @@ int main(int argc, char **argv)
 
         if (lockFile.getLockInfo(&pid, nullptr, nullptr)) {
             kill(static_cast<pid_t>(pid), SIGINT);
-            timeout = 3000;
+            timeout = -1;
         }
     }