Execute "GATHER DATA" when using --test

#### [Execute "GATHER DATA" when $PRINT is set to 1.](https://github.com/1951FDG/mkvdts2ac3/commit/ec88306802739eeed0bab3d476c714f9a3c59cdb)

**Before fix:**
population of ```$DTSTRACK```, ```$VALID```, ```$INFO```, ```$DTSLANG```, ```$DTSNAME```: false

**After fix:**
population of ```$DTSTRACK```, ```$VALID```, ```$INFO```, ```$DTSLANG```, ```$DTSNAME```: true