Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/diagnostics/tests/operatorsOverloading/AssignOperatorAmbiguity.txt

@@ -12,4 +12,4 @@ package kt1820 {
         internal final fun plus(/*0*/ m: kt1820.MyInt): kt1820.MyInt
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
-}
+}

compiler/testData/diagnostics/tests/operatorsOverloading/AssignmentOperations.txt

@@ -26,4 +26,4 @@ internal final class B {
     internal final fun plus(/*0*/ x: kotlin.Int): B
     internal final fun times(/*0*/ x: kotlin.Int): B
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
+}

compiler/testData/diagnostics/tests/operatorsOverloading/IteratorAmbiguity.txt

@@ -37,4 +37,4 @@ internal final class MyIterator {
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     internal final fun next(): MyElement
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
+}

compiler/testData/diagnostics/tests/operatorsOverloading/assignmentOperationsCheckReturnType.txt

@@ -18,4 +18,4 @@ internal final class B {
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     internal final fun plus(/*0*/ x: A): A
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
+}

compiler/testData/diagnostics/tests/operatorsOverloading/kt1028.txt

@@ -37,4 +37,4 @@ package kt1028 {
         internal final fun plusAssign(/*0*/ f: (T) -> kotlin.Unit): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
-}
+}

compiler/testData/diagnostics/tests/operatorsOverloading/kt3450.txt

@@ -34,4 +34,4 @@ kotlin.data() internal final class Pair</*0*/ out A, /*1*/ out B> {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}
+}