Fix testdata after switching Kotlin to version 1.8

the corresponding features - GenericInlineClassParameter && DataObjects
- were turned on in 1.8 right after the last check build, therefore the
discrepancy went unnoticed

compiler/testData/diagnostics/tests/dataClasses/strange.kt

@@ -3,7 +3,7 @@
     B(2)
 }
 
-<!UNSUPPORTED_FEATURE!>data<!> object Second
+data object Second
 
 <!WRONG_MODIFIER_TARGET!>data<!> interface Third