Update interfaces/input-events.idl (#18028)

Source: https://github.com/tidoust/reffy-reports/blob/8e42318/whatwg/idl/input-events.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/562928144
diff --git a/interfaces/input-events.idl b/interfaces/input-events.idl
index 0086128..c10aa32 100644
--- a/interfaces/input-events.idl
+++ b/interfaces/input-events.idl
@@ -4,11 +4,11 @@
 // Source: Input Events Level 1 (https://cdn.staticaly.com/gh/w3c/input-events/v1/index.html)
 
 partial interface InputEvent {
-    readonly attribute DataTransfer? dataTransfer;
-    sequence<StaticRange> getTargetRanges();
+   readonly attribute DataTransfer? dataTransfer;
+   sequence<StaticRange> getTargetRanges();
 };
 
 partial dictionary InputEventInit {
-    DataTransfer? dataTransfer = null;
-    sequence<StaticRange> targetRanges = [];
+   DataTransfer? dataTransfer = null;
+   sequence<StaticRange> targetRanges = [];
 };