Disable two finger scroll back gesture (#8662)

packages/devtools_app/web/styles.css

diff --git a/packages/devtools_app/web/styles.css b/packages/devtools_app/web/styles.css
index 11be011..ce49f00 100644
--- a/packages/devtools_app/web/styles.css
+++ b/packages/devtools_app/web/styles.css
@@ -3,3 +3,7 @@
     image-rendering: pixelated;
   }
 }
+
+body {
+  overscroll-behavior-x: none;
+}