Exclude overlapping initializers in StaticFieldUnscrambler

667 has an initializer like `a = b = new X()`. This broke the previous
version of the unscrambler, as it treated it as two separate
initializers: `a = b = new X()` and `b = new X()`. When the fields were
moved, the overlapping instructions were removed twice from the original
<clinit> method, making its size negative.

Even if this were fixed, it is still not safe to move the initializers,
as `new X()` would end up being executed twice, not once.

This commit fixes the problem by treating any simple initializer that
overlaps with any other simple initializer as a complex initializer.

Signed-off-by: Graham <gpe@openrs2.org>

deob-bytecode/src/main/kotlin/org/openrs2/deob/bytecode/remap/StaticFieldUnscrambler.kt

@@ -117,6 +117,19 @@ public class StaticFieldUnscrambler(
             }
         }
 
+        val overlappingInitializers = mutableSetOf<MemberDesc>()
+
+        for ((field1, initializer1) in simpleInitializers) {
+            for ((field2, initializer2) in simpleInitializers) {
+                if (field1 != field2 && initializer1.any { it in initializer2 }) {
+                    overlappingInitializers += field1
+                }
+            }
+        }
+
+        simpleInitializers -= overlappingInitializers
+        complexInitializers += overlappingInitializers
+
         return Pair(simpleInitializers, complexInitializers)
     }
 }