Less stringprepping in privacy modules

[NelsonVides]

A few less stringprepps in another module that comes up on every once in a while, like on opening sessions, when the privacy lists is queried the first time (then it's cached) for a message delivery, or when the privacy list is modified and then broadcasted.

[mongoose-im]

9011.1 / Erlang 23.0.3 / small_tests / 90f73e7
Reports root / small

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9011.2 / Erlang 23.0.3 / internal_mnesia / 90f73e7
Reports root/ big
OK: 1503 / Failed: 0 / User-skipped: 160 / Auto-skipped: 0

---

9011.4 / Erlang 23.0.3 / mysql_redis / 90f73e7
Reports root/ big
OK: 2766 / Failed: 0 / User-skipped: 233 / Auto-skipped: 0

---

9011.3 / Erlang 23.0.3 / odbc_mssql_mnesia / 90f73e7
Reports root/ big
OK: 2771 / Failed: 0 / User-skipped: 228 / Auto-skipped: 0

---

9011.7 / Erlang 23.0.3 / elasticsearch_and_cassandra_mnesia / 90f73e7
Reports root/ big
OK: 330 / Failed: 0 / User-skipped: 38 / Auto-skipped: 0

---

9011.5 / Erlang 23.0.3 / riak_mnesia / 90f73e7
Reports root/ big
OK: 1629 / Failed: 0 / User-skipped: 180 / Auto-skipped: 0

---

9011.6 / Erlang 23.0.3 / ldap_mnesia / 90f73e7
Reports root/ big
OK: 1405 / Failed: 0 / User-skipped: 258 / Auto-skipped: 0

---

9011.9 / Erlang 22.3 / pgsql_mnesia / 90f73e7
Reports root/ big / small
OK: 2784 / Failed: 0 / User-skipped: 215 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #3005 (5cbd211) into master (20d587c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3005   +/-   ##
=======================================
  Coverage   79.08%   79.08%           
=======================================
  Files         377      377           
  Lines       32835    32829    -6     
=======================================
- Hits        25967    25964    -3     
+ Misses       6868     6865    -3     

Impacted Files	Coverage Δ
src/metrics/mongoose_metrics_hooks.erl	97.05% <ø> (ø)
src/mongoose_hooks.erl	92.24% <ø> (ø)
src/ejabberd_c2s.erl	89.33% <100.00%> (+0.22%)	⬆️
src/ejabberd_sm.erl	75.76% <100.00%> (+0.15%)	⬆️
src/mod_last.erl	88.70% <100.00%> (-0.18%)	⬇️
src/mod_privacy.erl	86.61% <100.00%> (-0.17%)	⬇️
src/mongoose_privacy.erl	93.33% <100.00%> (ø)
src/ejabberd_s2s_out.erl	57.89% <0.00%> (-1.84%)	⬇️
src/mod_bosh_socket.erl	78.88% <0.00%> (-0.32%)	⬇️
src/mod_muc_room.erl	77.54% <0.00%> (-0.06%)	⬇️
... and 6 more

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[arcusfelis]

ok