message: Fix Use rootDir as PWD when parsing .fls file
  This a follow-up on related to
diff: @@ -539,7 +539,7 @@ export class Manager {
  this.extension.logger.addLogMessage('Cannot find fls file.')
  return
  }
  - const ioFiles = this.parseFlsContent(fs.readFileSync(flsFile).toString(), flsFile)
  + const ioFiles = this.parseFlsContent(fs.readFileSync(flsFile).toString(), rootDir)
  ioFiles.input.forEach((inputFile: string) => {
  // Drop files that are also listed as OUTPUT or should be ignored
  @@ -597,10 +597,9 @@ export class Manager {
  }
  }
  - private parseFlsContent(content: string, flsFile: string): {input: string[], output: string[]} {
  + private parseFlsContent(content: string, rootDir: string): {input: string[], output: string[]} {
  const inputFiles: Set<string> = new Set()
  const outputFiles: Set<string> = new Set()
  - const pwd = path.dirname(flsFile)
  const regex = /^(?:(INPUT)\s*(.*))|(?:(OUTPUT)\s*(.*))$/gm
  // regex groups
  // #1: an INPUT entry --> #2 input file path
  @@ -611,12 +610,12 @@ export class Manager {
  break
  }
  if (result[1]) {
  - const inputFilePath = path.resolve(pwd, result[2])
  + const inputFilePath = path.resolve(rootDir, result[2])
  if (inputFilePath) {
  inputFiles.add(inputFilePath)
  }
  } else if (result[3]) {
  - const outputFilePath = path.resolve(pwd, result[4])
  + const outputFilePath = path.resolve(rootDir, result[4])
  if (outputFilePath) {
  outputFiles.add(outputFilePath)
  }
  