FIR: fix incorrect handling of suspend function typealiases again

The previous attempt stopped this code from throwing an exception during
serialization, but the arity is still wrong so an exception is now throw
when reading the serialized type.

^KT-50997 Fixed

compiler/testData/codegen/box/typealias/incorrectTypeOfTypealiasForSuspendFTMM.kt

@@ -0,0 +1,13 @@
+// WITH_STDLIB
+// ISSUE: KT-50997 (multi-module variant)
+// MODULE: lib
+// FILE: lib.kt
+typealias MySuspendFunction = suspend (String, String) -> Unit
+
+fun foo(function: MySuspendFunction) {}
+
+// MODULE: main(lib)
+// FILE: main.kt
+fun bar() = foo { a, b -> a + b }
+
+fun box() = "OK"

compiler/testData/codegen/box/typealias/incorrectTypeOfTypealiasForSuspendFunctionalType.kt

@@ -2,4 +2,4 @@
 
 typealias MySuspendFunction = suspend (String) -> Unit
 fun foo(function: MySuspendFunction) {}
-fun box() = "OK"
+fun box() = "OK"