FIR: Update test data (repeated diagnostics)

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

compiler/fir/analysis-tests/testData/resolveWithStdlib/diagnostics/functionReturnTypeMismatchChecker/basic.kt

@@ -12,7 +12,7 @@ fun ok(): Int {
 }
 
 fun okOneLineFunction(): Int = 10 + 1
-fun errorOneLineFunction(): String = <!RETURN_TYPE_MISMATCH!>10 + 1<!>
+fun errorOneLineFunction(): String = <!RETURN_TYPE_MISMATCH, TYPE_MISMATCH!>10 + 1<!>
 
 class A {
     fun bar() {}
@@ -52,4 +52,4 @@ fun blockReturnValueTypeMatch2() : Int {
     if (1 > 2)
     else return <!RETURN_TYPE_MISMATCH!>1.0<!>
     return <!RETURN_TYPE_MISMATCH!>2.0<!>
-}
+}