Fix 'n' shortcut preventing typing that in filter boxes

Author: qu1ck

InteractiveHtmlBom/ibom.css

@@ -229,6 +229,7 @@ canvas:active {
   width: 30px;
   position: relative;
   user-select: none;
+  -moz-user-select: none;
 }
 
 .bom .bom-checkbox:before {

InteractiveHtmlBom/ibom.js

@@ -679,6 +679,9 @@ function setBomCheckboxes(value) {
 document.onkeydown = function(e) {
   switch (e.key) {
     case "n":
+      if (document.activeElement.type == "text") {
+        return;
+      }
       if (currentHighlightedRowId !== null) {
         checkBomCheckbox(currentHighlightedRowId, "placed");
         highlightNextRow();