FIR: Update diagnostics test data

Green code correctly became red

compiler/tests-spec/testData/diagnostics/linked/expressions/conditional-expression/p-6/neg/1.1.fir.kt

@@ -53,8 +53,8 @@ public class JavaClassCase3{
 // TESTCASE NUMBER: 3
 fun case3() {
     val x = JavaClassCase3.id(null) // Nothing!
-    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Nothing?")!>x<!>
-    val a = if (<!CONDITION_TYPE_MISMATCH!>x<!>) {
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Nothing..kotlin.Nothing?!")!>x<!>
+    val a = if (x) {
         "NOK"
     } else "NOK"
 }