Replace negative lookbehind with a second regex

This was causing errors on Safari.

presets/objects.js

@@ -75,7 +75,7 @@ function makeHeight(info, category, prefix = "", type = "objects") {
         views[object[0]] = {
             height: math.unit(object[1], object[2]),
             image: { source: src },
-            name: object[0].replace(/-/g, " ").replace(/\b(?<!')\w/g, x => x.toUpperCase()),
+            name: object[0].replace(/-/g, " ").replace(/\b\w/g, x => x.toUpperCase()).replace(/'[A-Z]/g, x => x.toLowerCase()),
             rename: true
         }
     });