FIR initializer: don't report type mismatch in SomeInt = Int case

compiler/testData/diagnostics/tests/numbers/numbersInSimpleConstraints.fir.kt

@@ -17,7 +17,7 @@ fun <T> otherGeneric(l: List<T>) {}
 fun test() {
     val a: Byte = id(1)
 
-    val b: Byte = <!INITIALIZER_TYPE_MISMATCH!>id(300)<!>
+    val b: Byte = id(300)
 
     val c: Int = <!INITIALIZER_TYPE_MISMATCH!>id(9223372036854775807)<!>
 
@@ -29,7 +29,7 @@ fun test() {
 
     val f: Byte = either(1, 2)
 
-    val g: Byte = <!INITIALIZER_TYPE_MISMATCH!>either(1, 300)<!>
+    val g: Byte = either(1, 300)
 
     other(<!ARGUMENT_TYPE_MISMATCH!>11<!>)