Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/diagnostics/tests/numbers/characterIsNotANumber.txt

@@ -1,4 +1,4 @@
 package
 
 internal fun foo(/*0*/ n: kotlin.Number): kotlin.Number
-internal fun test(): kotlin.Unit
+internal fun test(): kotlin.Unit

compiler/testData/diagnostics/tests/numbers/doublesInSimpleConstraints.txt

@@ -4,4 +4,4 @@ package a {
     internal fun </*0*/ T> either(/*0*/ t1: T, /*1*/ t2: T): T
     internal fun </*0*/ T> id(/*0*/ t: T): T
     internal fun test(): kotlin.Unit
-}
+}

compiler/testData/diagnostics/tests/numbers/intValuesOutOfRange.txt

@@ -4,4 +4,4 @@ package a {
     internal fun bar(/*0*/ l: kotlin.Long): kotlin.Long
     internal fun foo(/*0*/ i: kotlin.Int): kotlin.Int
     internal fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
-}
+}

compiler/testData/diagnostics/tests/numbers/numbersInSimpleConstraints.txt

@@ -39,4 +39,4 @@ package a {
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
-}
+}