Sort of fix DOM inspector's visual with webpages in dark theme mode

Related feedback:
- https://github.com/uBlockOrigin/uBlock-issues/discussions/2359#discussioncomment-4126129

Removing `color-scheme` property fixes the issue. Not sure why.

src/js/scriptlets/dom-inspector.js

@@ -855,16 +855,15 @@ pickerRoot.style.cssText = [
     'border: 0',
     'border-radius: 0',
     'box-shadow: none',
-    'color-scheme: light',
     'display: block',
     'height: 100%',
     'left: 0',
     'margin: 0',
     'opacity: 1',
-    'position: fixed',
     'outline: 0',
     'padding: 0',
     'pointer-events:none;',
+    'position: fixed',
     'top: 0',
     'visibility: visible',
     'width: 100%',