[daemon] Tiny grammar fix in error message

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d84f8f7) 84.06% compared to head (d620e66) 84.04%. Report is 14 commits behind head on main.

Files	Patch %	Lines
src/daemon/daemon.cpp	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3372 +/- ## ========================================== - Coverage 84.06% 84.04% -0.03% ========================================== Files 251 251 Lines 13793 13798 +5 ========================================== + Hits 11595 11596 +1 - Misses 2198 2202 +4 ```

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