Change Keyword `let` to `const` in `src/edit/toolbars/DistortableImage.PopupBar.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:

- 28 let tools = this.tools();
+ 28 const tools = this.tools();
- 30 let tool = tools.item(i).children[0];
+ 30 const tool = tools.item(i).children[0];

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

[segun-codes]

Hi @cesswairimu, @TildaDares, do you want to apply first-timer-only label to this issue? I figured 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!

Many thanks!

[ADK0010]

I'd like to try this!