fix: write the 0x prefix back onto each hex string in an array - #1122

Summary

EnsureHexPrefix on a string[] called the string helper and ignored the return value, so the array was handed back unchanged. new[] { "deadbeef", "0xabc" } stayed deadbeef and 0xabc.

The loop now writes each prefixed string back. A value that already has 0x is left as it is. A null array still returns null.

Someone who prefixes a batch of addresses or hashes before a call was getting the original strings. The method returned success and did not add the prefix.

Test plan

• The array case failed before the write-back (Assert.Equal on 0xdeadbeef) and passes after
• The same assertion is in ShouldEnsureHexPrefix
• Full Nethereum.ABI.UnitTests suite was not run here. That project pulls the rest of the solution. The focused test compiles HexByteConvertorExtensions.cs on net8.0 and is 1 passed

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