cmpv2: fix bad DER encoding of PollRepContent (#2197) #2637

Job	Run time
test (stable)	50s
build (1.85.0, wasm32-unknown-unknown)	36s
build (1.85.0, thumbv7em-none-eabi)	38s
build (stable, wasm32-unknown-unknown)	31s
build (stable, thumbv7em-none-eabi)	28s
test (1.85.0)	54s
minimal-versions	-1s
	3m 56s

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