Fix the error when outDir compiler option is specified

[aereal]

If outDir compiler option is specified, tss throws:

/.../node_modules/espower-typescript/node_modules/typescript-simple/index.js:135
            var text = file.text;
                           ^

TypeError: Cannot read property 'text' of undefined

Because TypeScript LS emits outputFiles consists of the files prefixed with outDir (e.g. built/file.js), so outputFiles never contain file.js.

Note:

This error encountered while I try to use espower-typescript.

[teppeis]

thanks! sorry to be late.