Tests: remove duplicate LANGUAGE test directives

To help them run on the old infrastructure, which light analysis tests
are still using.

compiler/testData/codegen/box/valueClasses/overrides_typeParameters.kt

@@ -1,7 +1,6 @@
 // WITH_STDLIB
 // TARGET_BACKEND: JVM_IR
-// LANGUAGE: +ValueClasses
-// LANGUAGE: +GenericInlineClassParameter
+// LANGUAGE: +ValueClasses, +GenericInlineClassParameter
 // CHECK_BYTECODE_LISTING
 
 interface AbstractPoint<T> {

compiler/testData/codegen/box/valueClasses/secondaryConstructorVisibilies.kt

@@ -2,7 +2,6 @@
 // LANGUAGE: +ValueClasses
 // TARGET_BACKEND: JVM_IR
 // WORKS_WHEN_VALUE_CLASS
-// LANGUAGE: +ValueClasses
 
 OPTIONAL_JVM_INLINE_ANNOTATION
 value class Z(val x: Int, val y: Int) {

compiler/testData/codegen/box/valueClasses/secondaryConstructorWithVararg.kt

@@ -2,7 +2,6 @@
 // LANGUAGE: +ValueClasses
 // TARGET_BACKEND: JVM_IR
 // WORKS_WHEN_VALUE_CLASS
-// LANGUAGE: +ValueClasses
 
 OPTIONAL_JVM_INLINE_ANNOTATION
 value class Z(val x: Int, val y: Int) {