[FIR] Don't set lambda parameter type to Nothing by default

... when the expected type is not a function type.
Instead set it to a new type variable.
This fixes a bunch of false negative CANNOT_INFER_PARAMETER_TYPE.

#KT-59882 Fixed

compiler/testData/diagnostics/tests/resolve/newLineLambda.fir.kt

@@ -112,6 +112,6 @@ fun testTwoLambdas() {
 fun f1(): (() -> Unit) -> (() -> Unit) -> Unit {
     return <!RETURN_TYPE_MISMATCH!>{ l1 ->
         l1()
-        <!TOO_MANY_ARGUMENTS!>{ l2 -> <!UNRESOLVED_REFERENCE!>l2<!>() }<!>
+        <!TOO_MANY_ARGUMENTS!>{ <!CANNOT_INFER_PARAMETER_TYPE!>l2<!> -> <!UNRESOLVED_REFERENCE!>l2<!>() }<!>
     }<!>
 }