Remove confusing default from token stream types #7803

Job	Run time
build test linux x86-64	1s
build test linux x86-64	4m 24s
check-rust	1s
check-rust	3m 51s
build test windows x86-64	1s
build test windows x86-64	9m 41s
check-website	1s
check-website	13s
scarb-metadata compatibility check	1s
scarb-metadata compatibility check	46s
doc tests	1s
doc tests	3m 16s
test ${{ matrix.platform.name }} ${{ matrix.partition }}/8	1s
test linux x86-64 1/8	16m 24s
test linux x86-64 2/8	18m 0s
test linux x86-64 3/8	14m 26s
test linux x86-64 4/8	14m 2s
test linux x86-64 5/8	11m 45s
test linux x86-64 6/8	10m 12s
test linux x86-64 7/8	10m 14s
test linux x86-64 8/8	10m 53s
test windows x86-64 1/8	15m 19s
test windows x86-64 2/8	16m 28s
test windows x86-64 3/8	14m 25s
test windows x86-64 4/8	12m 56s
test windows x86-64 5/8	11m 53s
test windows x86-64 6/8	9m 18s
test windows x86-64 7/8	9m 53s
test windows x86-64 8/8	10m 46s
	3h 49m 12s

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