Psi2ir: fix parameter indices when generating extension invoke call

Incorrect `valueParameter` was passed to `generateValueArgument`, which
resulted in incorrect type being considered for generating suspend
conversion.

 #KT-50949 Fixed

compiler/testData/codegen/box/suspendConversion/kt50949_suspendConversionForExtensionFunction.kt

@@ -0,0 +1,8 @@
+// !LANGUAGE: +SuspendConversion
+// IGNORE_BACKEND: JVM
+
+fun box(): String {
+    val foo: String.(suspend () -> Unit) -> String = { this }
+    val f: () -> Unit = {}
+    return "OK".foo(f)
+}