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/ir/irText/expressions/suspendConversionForExtensionFunction.kt

@@ -0,0 +1,8 @@
+// SKIP_KT_DUMP
+// !LANGUAGE: +SuspendConversion
+
+fun main() {
+    val foo: String.(suspend () -> Unit) -> Unit = {}
+    val f: () -> Unit = {}
+    "".foo(f)
+}