trie: remove redundant comparision in VerifyRangeProof #30951
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The code was introduced in #21250, where lastKey was passed in by the caller.
In #28331, the logic was modified to take the last element from keys as lastKey.
When keys contains only one element, lastKey is equal to keys[0].
After comparing firstKey and lastKey, there is no need to compare firstKey with keys[0] again.