Fix copying filters for e2t messages and conditional redirects.

[torotil]

This fixes a bug where filters were removed from one message/redirect
when they were copied to another (and their id was kept).

[codecov]

Codecov Report

Merging #122 into 7.x-2.x will increase coverage by 0.14%.
The diff coverage is 87.5%.

@@              Coverage Diff              @@
##             7.x-2.x     #122      +/-   ##
=============================================
+ Coverage      40.92%   41.07%   +0.14%     
- Complexity      1744     1746       +2     
=============================================
  Files            274      274              
  Lines           9939     9942       +3     
  Branches         154      154              
=============================================
+ Hits            4068     4084      +16     
+ Misses          5868     5850      -18     
- Partials           3        8       +5

Impacted Files	Coverage Δ	Complexity Δ
...rd/redirects_app/src/components/RedirectDialog.vue	0% <0%> (ø)	0 <0> (ø)	⬇️
campaignion_email_to_target/src/Filter.php	89.47% <100%> (+0.38%)	20 <0> (ø)	⬇️
..._target/messages_app/src/components/SpecDialog.vue	38.46% <100%> (+18.98%)	0 <0> (ø)	⬇️
campaignion_action/src/Redirects/Filter.php	87.34% <100%> (-0.16%)	31 <0> (ø)
campaignion_action/src/Redirects/Redirect.php	95.69% <100%> (ø)	37 <0> (+1)	⬆️
...ampaignion_email_to_target/src/MessageTemplate.php	93.02% <100%> (ø)	33 <0> (+1)	⬆️

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