fix(format_to_n): return the total not truncated output size instead the truncated size

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (aa3741e) 99.38% compared to head (943f683) 99.38%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #62 +/- ## ======================================= Coverage 99.38% 99.38% ======================================= Files 56 56 Lines 5681 5681 ======================================= Hits 5646 5646 Misses 35 35 ``` | [Files](https://app.codecov.io/gh/Viatorus/emio/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert) | Coverage Δ | | |---|---|---| | [include/emio/iterator.hpp](https://app.codecov.io/gh/Viatorus/emio/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-aW5jbHVkZS9lbWlvL2l0ZXJhdG9yLmhwcA==) | `100.00% <100.00%> (ø)` | | | [test/unit\_test/test\_format\_to\_n\_api.cpp](https://app.codecov.io/gh/Viatorus/emio/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-dGVzdC91bml0X3Rlc3QvdGVzdF9mb3JtYXRfdG9fbl9hcGkuY3Bw) | `100.00% <100.00%> (ø)` | | | [test/unit\_test/test\_iterator.cpp](https://app.codecov.io/gh/Viatorus/emio/pull/62?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Toni+Neubert#diff-dGVzdC91bml0X3Rlc3QvdGVzdF9pdGVyYXRvci5jcHA=) | `100.00% <100.00%> (ø)` | |

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