Fix active context is removed wrongly

[nachoBonafonte]

We must only reset current context when the span being ended is the active span

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (46c8adc) 66.32% compared to head (309f597) 66.37%.

❗ Current head 309f597 differs from pull request most recent head c3e0df5. Consider uploading reports for the commit c3e0df5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #448      +/-   ##
==========================================
+ Coverage   66.32%   66.37%   +0.05%     
==========================================
  Files         331      331              
  Lines       14109    14113       +4     
==========================================
+ Hits         9358     9368      +10     
+ Misses       4751     4745       -6     

Files Changed	Coverage Δ
...nTelemetryApi/Context/ActivityContextManager.swift	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[vvydier]

looks good!

[nachoBonafonte]

Fixes #420