Remove LANGUAGE_VERSION from non-coroutine codegen tests

Most of these tests used this directive as a way to opt in to a new
language feature, and most of those features are already stable for a
long time, so no opt-in is needed. Some other tests used the directive
to opt out from a language feature, replace those by the `LANGUAGE`
directive. One test used the directive to test behavior that actually
depended on the API version; use `API_VERSION` directive there instead.

compiler/testData/codegen/box/objects/companionObjectAccess/kt27117_lv12.kt

@@ -1,4 +1,4 @@
-// LANGUAGE_VERSION: 1.2
+// !LANGUAGE: -ProperVisibilityForCompanionObjectInstanceField
 
 inline fun on(body: () -> Any) = body().toString()
 
@@ -13,4 +13,4 @@ class A {
 }
 
 
-fun box() = A().test()
+fun box() = A().test()

compiler/testData/codegen/box/objects/companionObjectAccess/kt27117_lv13.kt

@@ -1,5 +1,3 @@
-// LANGUAGE_VERSION: 1.3
-
 inline fun on(body: () -> Any) = body().toString()
 
 class A {
@@ -13,4 +11,4 @@ class A {
 }
 
 
-fun box() = A().test()
+fun box() = A().test()

compiler/testData/codegen/box/objects/companionObjectAccess/kt27121_lv12.kt

@@ -1,4 +1,4 @@
-// LANGUAGE_VERSION: 1.2
+// !LANGUAGE: -ProperVisibilityForCompanionObjectInstanceField
 
 interface A {
     fun test() = ok()

compiler/testData/codegen/box/objects/companionObjectAccess/kt27121_lv13.kt

@@ -1,5 +1,3 @@
-// LANGUAGE_VERSION: 1.3
-
 interface A {
     fun test() = ok()