[rosetta] Remove supported currencies with an empty symbol #67871

Job	Run time
file_change_determinator	11s
rust-doc-tests	0s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-unit-tests	0s
rust-cargo-deny	1m 47s
general-lints	30s
rust-lints	4m 14s
rust-check-merge-base	2m 1s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	0s
rust-targeted-unit-tests	6m 58s
rust-build-cached-packages	0s
	15m 41s

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