[FIX] web_editor: unlink toolbar button is displayed when range is collapsed

Before this commit:

In mobile view, when text as well as link is in range the unlink button
in the toolbar was visible.

After this commit:

The unlink button is only displayed when link is in range

Task-3184393

closes odoo/odoo#115161

X-original-commit: 5cab1c90b13074e642f3da3a773c55d37419f90b
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js

@@ -2731,11 +2731,13 @@ export class OdooEditor extends EventTarget {
             }
         }
         if (this.options.autohideToolbar && !this.toolbar.contains(sel.anchorNode)) {
-            if (show !== undefined && !this.isMobile) {
-                this.toolbar.style.visibility = show ? 'visible' : 'hidden';
-            }
-            if (show === false) {
-                return;
+            if (!this.isMobile) {
+                if (show !== undefined) {
+                    this.toolbar.style.visibility = show ? 'visible' : 'hidden';
+                }
+                if (show === false) {
+                    return;
+                }
             }
         }
         if (!this.isSelectionInEditable(sel)) {