notify: per-username result counts (fixes #2990)

[SkxOverKill]

Summary

Fixes #2990 — the "Search completed with X results" line showed a cumulative total across all usernames (and relied on a fragile countResults() - 1 off-by-one compensation).

Root cause

sherlock_project/notify.py used a module-level globvar that is never reset. A single QueryNotifyPrint instance is created once in main() (sherlock.py:812) and shared across every username scan, so the counter accumulated across scans.

Changes

• sherlock_project/notify.py
  • Remove the module-level globvar.
  • Track the count on the instance (self._result_count, initialised in __init__).
  • finish() reads self._result_count directly (no extra increment + - 1) and resets it so the next username scan starts from zero.
• sherlock_project/sherlock.py
  • Call query_notify.finish() inside the per-username loop so each scan prints its own "Search completed with X results" line.
• tests/test_notify.py — new offline unit tests covering per-instance counts and reset between scans.

Verification

• Reproduced before: two scans (2 claimed, then 1 claimed) printed 2 results then 4 results. After the fix: 2 results then 1 results.
• pytest tests/test_notify.py passes (2 passed).
• Full offline suite remains green (the only pre-existing failures are environment-related py -m subprocess tests that also fail on master).