Update XmlTests.cs (#1659)

`ScrubAttribute()` Test was calling `IgnoreMember`
`IgnoreAttribute()` Test was calling `ScrubMember`

Author: phillduffy

src/Verify.Tests/XmlTests.cs

@@ -168,7 +168,7 @@ public Task Scrubbing()
     }
 
     [Fact]
-    public Task ScrubAttribute()
+    public Task IgnoreAttribute()
     {
         var document = XDocument.Parse(
             """
@@ -182,7 +182,7 @@ public Task ScrubAttribute()
     }
 
     [Fact]
-    public Task IgnoreAttribute()
+    public Task ScrubAttribute()
     {
         var document = XDocument.Parse(
             """
@@ -224,4 +224,4 @@ public Task EmptyTagWithAttributes() =>
                <node>text</node>
              </body>
              """);
-}
+}