JVM_IR: change parameter type computation in InlineCallableReferenceToLambda

The reference type is approximated in Psi2Ir, so we may get Nothing as
a reference type argument. Better look at the arguments of the
referenced function.

compiler/testData/codegen/box/callableReference/function/argumentTypes.kt

@@ -0,0 +1,12 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+inline fun <TT> id(x: TT): TT = x
+inline fun <TT> String.extId(x: TT): String = this
+
+private fun <T> ff(value: T?): String {
+    // In PSI2IR, the funcref is approximated to Function1<Nothing, Pair<String, T>>
+    value?.let(::id)
+    return value?.let("OK"::extId)!!
+}
+
+fun box() = ff("arg")
+