tiflash: correct the default values of logger.size and logger.count

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[JaySon-Huang]

TiFlash still use "100M" as the logger.size default and "10" as the logger.count default in the codebase. https://github.com/pingcap/tiflash/blob/661e9b5887144636797a3e6e583d5a383ebfd17e/libs/libdaemon/src/BaseDaemon.cpp#L758
"1000M" and "20" comes from the tiflash configuration hard code in tiup cluster https://github.com/pingcap/tiup/blob/c567110b2bc3a3d560fd6a04c04be538758a60e0/pkg/cluster/spec/tiflash.go#L559-L560