Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/diagnostics/tests/substitutions/kt1558-short.txt

@@ -1,4 +1,4 @@
 package
 
 internal fun testArrays(/*0*/ ci: kotlin.List<kotlin.Int>): kotlin.Unit
-internal fun </*0*/ E> kotlin.List<kotlin.Any?>.toArray(/*0*/ ar: kotlin.Array<E>): kotlin.Array<E>
+internal fun </*0*/ E> kotlin.List<kotlin.Any?>.toArray(/*0*/ ar: kotlin.Array<E>): kotlin.Array<E>

compiler/testData/diagnostics/tests/substitutions/kt4887.txt

@@ -9,4 +9,4 @@ package h {
         internal final fun test(): kotlin.Unit
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
-}
+}

compiler/testData/diagnostics/tests/substitutions/upperBoundsSubstitutionForOverloadResolutionWithAmbiguity.txt

@@ -5,4 +5,4 @@ internal fun </*0*/ T> test(/*0*/ l: kotlin.List<T>): kotlin.Unit
 
 package foo {
     internal fun </*0*/ T> f(/*0*/ l: kotlin.List<T>): kotlin.Unit
-}
+}

compiler/testData/diagnostics/tests/substitutions/upperBoundsSubstitutionForOverloadResolutionWithErrorTypes.txt

@@ -3,4 +3,4 @@ package
 internal fun </*0*/ T> f1(/*0*/ l: [ERROR : List1<T>]): T
 internal fun </*0*/ T> f1(/*0*/ l: [ERROR : List2<T>]): T
 internal fun </*0*/ T> f1(/*0*/ c: kotlin.Collection<T>): T
-internal fun </*0*/ T> test(/*0*/ l: kotlin.List<T>): kotlin.Unit
+internal fun </*0*/ T> test(/*0*/ l: kotlin.List<T>): kotlin.Unit