antlr4ts cli's -o option is wrong affected by the grammar file option

[alingse]

The command

node_modules/.bin/antlr4ts ../Thrift.g4 -o ./src 

I want to generate code to ./src from the grammar file ../Thrift.g4

but it wrong generate code like this.

Generating file 'thrift-parser/typescript/./src/../ThriftLexer.interp' for grammar '../Thrift.g4'
Generating file 'thrift-parser/typescript/./src/../ThriftLexer.ts' for grammar '../Thrift.g4'
Generating file 'thrift-parser/typescript/./src/../ThriftLexer.tokens' for grammar '../Thrift.g4'
Generating file 'thrift-parser/typescript/./src/../Thrift.interp' for grammar '../Thrift.g4'
Generating file 'thrift-parser/typescript/./src/../ThriftParser.ts' for grammar '../Thrift.g4'
Generating file 'typescript/./src/../ThriftListener.ts' for grammar '../Thrift.g4'
Generating file 'typescript/./src/../Thrift.tokens' for grammar '../Thrift.g4'

thers is no need to add '../' to output option

I will open a PR to edit this 🤔