Fix error output in formatWarnErrorMessage function

[KristjanESPERANTO]

While investigating issue #548, I noticed that there are unnecessary outputs.

The formatWarnErrorMessage function had a syntax error (} { instead of } else {) and duplicate console output.

To be clear: This PR doesn't fix #548.

Before

$ node test.mjs
An error occurred during evaluation of the value "Mo-We 09:00-17:00; Th 07:00-21:00; Fr 07:00-(sunset-1); Sa off; Su 09:00-16:30". Please file a bug report or pull request: https://github.com/opening-hours/opening_hours.js. Bug in warning generation code which could not determine the exact position of the warning or error in value.
Last token for rule: [[[5,"weekday",43,"weekday"],[7,"number",40,"time"],[":","timesep",38],[0,"number",37],["-","-",35],["(","(",34],["sunset","timevar",33],["-","-",27],[1,"number",26],[")",")",25]],false,24]
Mo-We 09:00-17:00; Th 07:00-21:00; Fr 07:00-(sunset-1) <--- (Calculation with variable time is not in the right syntax (time).)


tokens_to_use[nrule][2] is undefined. This is ok if nrule is the last rule.
Mo-We 09:00-17:00; Th 07:00-21:00; Fr 07:00-(sunset-1) <--- (Calculation with variable time is not in the right syntax (time).)

This PR removes the last two lines. In my understanding the line before the last one should not be printed at all for this, and the last one is redundant.

After

$ node test.mjs
An error occurred during evaluation of the value "Mo-We 09:00-17:00; Th 07:00-21:00; Fr 07:00-(sunset-1); Sa off; Su 09:00-16:30". Please file a bug report or pull request: https://github.com/opening-hours/opening_hours.js. Bug in warning generation code which could not determine the exact position of the warning or error in value.
Last token for rule: [[[5,"weekday",43,"weekday"],[7,"number",40,"time"],[":","timesep",38],[0,"number",37],["-","-",35],["(","(",34],["sunset","timevar",33],["-","-",27],[1,"number",26],[")",")",25]],false,24]
Mo-We 09:00-17:00; Th 07:00-21:00; Fr 07:00-(sunset-1) <--- (Calculation with variable time is not in the right syntax (time).)

Testscript

import opening_hours from 'opening_hours';

try {
  new opening_hours('Mo-We 09:00-17:00; Th 07:00-21:00; Fr 07:00-(sunset-1); Sa off; Su 09:00-16:30')
} catch (e) {
  console.error(e);
}

[ypid]

This PR doesn't fix #548.

I would say you fixed it.

[KristjanESPERANTO]

Yes, the third commit (which makes the fix) wasn't actually intended for this PR, as it went a bit beyond the scope of this PR. But let's leave it as it is, it's a good commit. And I'll try to be a bit more attentive in future.