Adapt ScriptCodegenTests to last changes

Get rid of possibility to configure script definition without template
class, therefore all tests now are using default script argument

compiler/testData/codegen/script/parameterClosure.kts

@@ -1,6 +1,6 @@
-// param: x: kotlin.Int: 10
+// param: 10
 
-fun addX(y: Int) = x + y
+fun addX(y: Int) = java.lang.Integer.parseInt(args[0]) + y
 
 val rv = addX(3)