Fix: Edited messages appear twice in fulltext search

[adnull]

As stated in #3358 the search response contains both original and edited message.
This PR fixes it by removing of the original message from the fulltext index after indexing the edit message event.
I also made some cosmetic changes/fixes i found in the code

Signed-off-by: Alexander Dubovikov <[email protected]>

[S7evinK]

LGTM otherwise!

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 67.43%. Comparing base (3e62b98) to head (d46738a).

Files	Patch %	Lines
syncapi/consumers/roomserver.go	54.54%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3363      +/-   ##
==========================================
- Coverage   67.44%   67.43%   -0.02%     
==========================================
  Files         521      521              
  Lines       47366    47378      +12     
==========================================
+ Hits        31946    31948       +2     
- Misses      11422    11429       +7     
- Partials     3998     4001       +3     

Flag	Coverage Δ
unittests	52.76% <66.66%> (+<0.01%)	⬆️

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[S7evinK]

Thanks for this!