fix: Dropped media detection fires for slow media in the first 2 sec.

[damencho]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 19.24%. Comparing base (31ab705) to head (4fd02b0).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../main/java/org/jitsi/jigasi/SipGatewaySession.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #602      +/-   ##
============================================
- Coverage     19.28%   19.24%   -0.04%     
+ Complexity      310      309       -1     
============================================
  Files            83       83              
  Lines          7142     7143       +1     
  Branches        944      944              
============================================
- Hits           1377     1375       -2     
- Misses         5539     5541       +2     
- Partials        226      227       +1     

Files with missing lines	Coverage Δ
.../main/java/org/jitsi/jigasi/SipGatewaySession.java	45.40% <0.00%> (-0.09%)	⬇️

... and 1 file with indirect coverage changes

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[bgrozev]

Suggest saving the initial timestamp instead of replying on a certain interval.