QUIC APL: Fix incoming default stream popping #1908

Job	Run time
basic_gcc	7m 58s
check_docs	1m 23s
check_update	1m 51s
check-ansi	6m 8s
basic_clang	7m 21s
address_ub_sanitizer	14m 33s
minimal	3m 33s
no-deprecated	8m 20s
non-caching	18m 31s
no-shared (ubuntu-latest)	5m 50s
no-shared (macos-latest)	9m 30s
enable_brotli_and_asan_ubsan	13m 10s
enable_brotli_and_zstd_dynamic	7m 49s
enable_brotli_dynamic	7m 10s
enable_non-default_options	7m 59s
enable_zstd_dynamic	7m 16s
memory_sanitizer	18m 57s
fips_and_ktls	9m 16s
threads_sanitizer	6m 20s
buildtest	9m 53s
enable_zstd_and_asan_ubsan	12m 55s
enable-tfo (ubuntu-latest)	7m 30s
enable-tfo (macos-latest)	9m 27s
external-test-cf-quiche	6m 16s
external-test-pyca (1.51.0, 3.9)	12m 14s
external-tests	14m 20s
legacy	7m 46s
no-legacy	10m 4s
out-of-source-and-install (ubuntu-latest)	9m 57s
out-of-source-and-install (macos-latest)	13m 46s
	4h 37m 3s

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