[FIX] devtools: fix inspected path

This commit fixes the handling of the inspected path in the
getComponentsTree method so that it is reset when the given one does
not exist anymore. It solves a crash of the method anytime this would
happen which would prevent the tree from updating correctly.

tools/devtools/src/page_scripts/owl_devtools_global_hook.js

@@ -1527,6 +1527,9 @@
     // Use inspectedPath to specify the path of the selected component
     getComponentsTree(inspectedPath = null, oldTrees = null, oldDetails = null) {
       const appsArray = [...this.apps];
+      if (inspectedPath && !this.getComponentNode(inspectedPath)) {
+        inspectedPath = null;
+      }
       const trees = appsArray.map((app, index) => {
         let oldTree;
         if (oldTrees) {