Change Keyword `let` to `const` in `src/mapmixins/BoxCollector.js`

[segun-codes]

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Below is a "diff" showing in red (and a -) which lines to remove, and in green (and a +) which lines to add:

- 83 let size = this._bounds.getSize();
+ 83 const size = this._bounds.getSize();
- 127 let zoom = this._map.getZoom();
+ 127 const zoom = this._map.getZoom();
- 128 let center = this._map.getCenter();
+ 128 const center = this._map.getCenter();

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(This issue was created by First-Timers-Bot.)

[segun-codes]

Hi @cesswairimu, @TildaDares, do you want to designate this issue with first-timer-only label? It is my considered opinion that any variable currently and effectively used as "const" should be declared as such until there's such a need to revert to "let", perhaps due to code extension in the future. Many thanks!

[sandeshShahapur]

hello, i would like to make this change. i am new around here

[shagariboy]

Hello, I would like to handle this. Thanks

[sandeshShahapur]

Hello @segun-codes, i have created a pull request to this issue, please review it when you are available. Thank you!