More redaction improvements

[jplatte]

Part of #607.

[codecov-commenter]

Codecov Report

Merging #652 (351672c) into main (be2a818) will increase coverage by 0.02%.
The diff coverage is 47.05%.

❗ Current head 351672c differs from pull request most recent head 247ddf5. Consider uploading reports for the commit 247ddf5 to get more accurate results

@@            Coverage Diff             @@
##             main     #652      +/-   ##
==========================================
+ Coverage   73.45%   73.47%   +0.02%     
==========================================
  Files         101      102       +1     
  Lines       15161    15157       -4     
==========================================
+ Hits        11136    11137       +1     
+ Misses       4025     4020       -5     

Impacted Files	Coverage Δ
crates/matrix-sdk-base/src/rooms/mod.rs	58.91% <ø> (+2.33%)	⬆️
crates/matrix-sdk/src/encryption/mod.rs	27.16% <ø> (ø)
crates/matrix-sdk-base/src/rooms/members.rs	32.14% <25.00%> (+4.87%)	⬆️
crates/matrix-sdk-base/src/store/ambiguity_map.rs	84.14% <33.33%> (ø)
crates/matrix-sdk-base/src/utils.rs	43.47% <43.47%> (ø)
crates/matrix-sdk-base/src/rooms/normal.rs	80.46% <100.00%> (+0.05%)	⬆️
crates/matrix-sdk-base/src/store/memory_store.rs	93.81% <100.00%> (ø)
crates/matrix-sdk-sled/src/state_store.rs	83.03% <100.00%> (ø)

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[gnunicorn]

lgtm