Remove dead code before performing final field analysis

If we don't do this then we incorrectly mark some fields as final, due
to writes present inside if blocks removed by ConstantArgTransformer.

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

deob/src/main/java/dev/openrs2/deob/transform/FinalFieldTransformer.kt

@@ -5,6 +5,7 @@ import dev.openrs2.asm.MemberDesc
 import dev.openrs2.asm.MemberRef
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
+import dev.openrs2.asm.removeDeadCode
 import dev.openrs2.asm.transform.Transformer
 import dev.openrs2.deob.analysis.FieldWriteAnalyzer
 import dev.openrs2.deob.analysis.FieldWriteCount
@@ -28,6 +29,8 @@ class FinalFieldTransformer : Transformer() {
     }
 
     override fun transformCode(classPath: ClassPath, library: Library, clazz: ClassNode, method: MethodNode): Boolean {
+        method.removeDeadCode(clazz.name)
+
         val constructor = method.name == "<init>" || method.name == "<clinit>"
         val constructorStatic = (method.access and Opcodes.ACC_STATIC) != 0
         val thisCall = if (constructor && !constructorStatic) {