Close right edit panel on "Enter" keyboard click

src/routes/+page.svelte

@@ -666,9 +666,16 @@
   }
 
   let validateBtnHeight = 0;
+
+  function onKeyDown(e) {
+    switch (e.keyCode) {
+      case 13: // 'Enter' key
+        if (displayMode.edit !== undefined) changeTestCaseToEditIndex(undefined)
+    }
+  }
 </script>
 
-<svelte:window bind:innerWidth={windowInnerWidth} />
+<svelte:window bind:innerWidth={windowInnerWidth} on:keydown={onKeyDown} />
 <svelte:head>
   <title>Calculs | {data.title}</title>
 </svelte:head>