Correct fix-irreversible-blocks option default value which was set in…

[linhuang-blockone]

…correctly

Change Description

https://blockone.atlassian.net/browse/EPE-922

Default value of fix-irreversible-blocks was set by
("fix-irreversible-blocks", bpo::value<bool>()->default_value("false"). The "false" makes it as a string and unintentionally causes the default value to be true. This in turn causes failure of reconstructing blocks.index in block_log_impl of block_log.cpp as it requires correct value of fix_irreversible_blocks.

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