FIR: Update test data (repeated diagnostics)

They are a bit redundant, but it needs additional work to be done
to avoid them

compiler/testData/diagnostics/tests/classLiteral/expressionWithNullableType.fir.kt

@@ -0,0 +1,16 @@
+// FILE: J.java
+
+public interface J {
+    String platformString();
+}
+
+// FILE: test.kt
+
+fun f1(x: Int?): Any = <!EXPRESSION_OF_NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>x<!>::class
+fun <T> f2(t: T): Any = <!EXPRESSION_OF_NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>t<!>::class
+fun <T> f21(t: T): Any where T : Any?, T : Comparable<T> = t::class
+fun <S : String?> f3(s: S): Any = <!EXPRESSION_OF_NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>s<!>::class
+fun <U : Any> f4(u: U?): Any = <!EXPRESSION_OF_NULLABLE_TYPE_IN_CLASS_LITERAL_LHS!>u<!>::class
+fun f5(c: List<*>): Any = <!EXPRESSION_OF_NULLABLE_TYPE_IN_CLASS_LITERAL_LHS, TYPE_MISMATCH!>c[0]<!>::class
+
+fun f6(j: J): Any = j.platformString()::class

compiler/testData/diagnostics/tests/classLiteral/expressionWithNullableType.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // FILE: J.java
 
 public interface J {