fix in `gglikert()`

[larmarange]

the function could be called directly with ggstats::gglikert() without requiring the full package to be loaded

fix #47

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (961f2d2) 96.11% compared to head (6e0dbb0) 96.11%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #48 +/- ## ======================================= Coverage 96.11% 96.11% ======================================= Files 12 12 Lines 1134 1134 ======================================= Hits 1090 1090 Misses 44 44 ``` | [Files](https://app.codecov.io/gh/larmarange/ggstats/pull/48?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange) | Coverage Δ | | |---|---|---| | [R/gglikert.R](https://app.codecov.io/gh/larmarange/ggstats/pull/48?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joseph+Larmarange#diff-Ui9nZ2xpa2VydC5S) | `95.42% <100.00%> (ø)` | |

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