Philip Withnall c02890645b tests: Drop redundant store
This fixes a scan-build warning:
```
../../../../source/glib/gio/tests/gdbus-tests.c:146:3: warning: Value stored to 'watch_id' is never read [deadcode.DeadStores]
  watch_id = 0;
  ^
```

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #1767
2022-04-28 10:43:13 +01:00
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