avm2: Trim the start of processing instruction values

core/src/avm2/e4x.rs

@@ -469,7 +469,7 @@ impl<'gc> E4XNode<'gc> {
                             ),
                             AvmString::new_utf8_bytes(
                                 activation.context.gc_context,
-                                value.as_bytes(),
+                                value.trim_start().as_bytes(),
                             ),
                         )
                     } else {

tests/tests/swfs/from_avmplus/e4x/XML/e13_4_4_28/test.toml

@@ -1,2 +1 @@
 num_ticks = 1
-known_failure = true

tests/tests/swfs/from_avmplus/e4x/XMLList/e13_5_4_17/test.toml

@@ -1,2 +1 @@
 num_ticks = 1
-known_failure = true