http2: fix kUpdateTimer timer refresh #18062
                
     Merged
            
            
          
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Fixes an oversight from 93eb68e 😬
Wasn't caught by a test... @nodejs/http2 anyone have suggestions on how to write a test? Or if you want to write one and push it here that would be fine too.
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes (Unfortunately)Affected core subsystem(s)
http2