Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/diagnostics/testsWithStdLib/annotations/platformStatic/functions.txt

@@ -63,4 +63,4 @@ internal trait B {
             public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
         }
     }
-}
+}

compiler/testData/diagnostics/testsWithStdLib/annotations/platformStatic/localFun.txt

@@ -1,3 +1,3 @@
 package
 
-internal fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
+internal fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit

compiler/testData/diagnostics/testsWithStdLib/annotations/platformStatic/property.txt

@@ -34,4 +34,4 @@ internal final class A {
             public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
         }
     }
-}
+}