[egs] Fix an issue that egs/csj/s5/local/csj_data_prep.sh always fails if target file ($dir/lexicon.txt) already exists. #2682
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egs/csj has an issue that
s5/local/csj_data_prep.shalways fails if target file ($dir/lexicon.txt) already exists.It happens when execute
egs/csj/s5/run.shagain after run.sh is finished.This commit fixes this issue.