[DevTools] Upon active timeline recording, label cursor should behave as a default cursor.

Source/devtools/front_end/inspector.css

Index: Source/devtools/front_end/inspector.css
diff --git a/Source/devtools/front_end/inspector.css b/Source/devtools/front_end/inspector.css
index 7dd52292356294c579f9f5bde625cf2f677c505c..497c5ffcce6bfb2333873f011397b2eae2b675d8 100644
--- a/Source/devtools/front_end/inspector.css
+++ b/Source/devtools/front_end/inspector.css
@@ -47,6 +47,11 @@ label:hover input {
     box-shadow: 0 0 3px highlight;
 }
 
+label.dimmed {
+    opacity: 0.6;
+    cursor: default;
+}
+
 fieldset[disabled] label:hover input {
     box-shadow: none;
 }