List view shows each map twice

[TomGoBravo]

Each time applyGlobalStyles is called a map div is appended to the DOM after the textarea. I added logging in processLeafletWidget and see that there are two calls:

In form.js:

    // Apply global styles for current page after page loaded
    $(function() {
        faForm.applyGlobalStyles(document);
    });

and bs4_modal.js

$(function() {
  // Apply flask-admin form styles after the modal is loaded
  window.faForm.applyGlobalStyles(document);
});

I don't know if both calls to applyGlobalStyles are needed. A hack fix is exiting processLeafletWidget if the textarea is already hidden.

[TomGoBravo]

@mrjoes : please take a look at my proposed fix (or workaround?) #2354