Fix handling of argumentsAndReturnSizes for static methods

asm/src/main/java/dev/openrs2/asm/StackMetadata.kt

@@ -205,8 +205,8 @@ fun AbstractInsnNode.stackMetadata(): StackMetadata = when (this) {
         val argumentsAndReturnSizes = Type.getArgumentsAndReturnSizes(desc)
         val pushes = argumentsAndReturnSizes and 0x3
         var pops = argumentsAndReturnSizes shr 2
-        if (opcode != Opcodes.INVOKESTATIC) {
-            pops++
+        if (opcode == Opcodes.INVOKESTATIC) {
+            pops--
         }
         StackMetadata(pops, pushes)
     }

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

@@ -179,7 +179,7 @@ class DummyArgTransformer : Transformer() {
 
             var callerSlots = Type.getArgumentsAndReturnSizes(method.desc) shr 2
             if (method.access and Opcodes.ACC_STATIC != 0) {
-                callerSlots++
+                callerSlots--
             }
             if (load.`var` >= callerSlots) {
                 continue