Merge pull request #4533 from crazyserver/MOBILE-4196

MOBILE-4196 bootstrap: Let Ionic manage the width of the modals

Author: dpalou

src/theme/components/bootstrap/_variables.scss

@@ -1529,10 +1529,10 @@ $modal-footer-bg:                   null !default;
 $modal-footer-border-color:         $modal-header-border-color !default;
 $modal-footer-border-width:         $modal-header-border-width !default;
 
-$modal-sm:                          300px !default;
-$modal-md:                          500px !default;
-$modal-lg:                          800px !default;
-$modal-xl:                          1140px !default;
+$modal-sm:                          auto !default;
+$modal-md:                          auto !default;
+$modal-lg:                          auto !default;
+$modal-xl:                          auto !default;
 
 $modal-fade-transform:              translate(0, -50px) !default;
 $modal-show-transform:              none !default;