Remove TODO comments about codegen not being able to work with hidden fields

Author: ArsenHD

utbot-framework/src/test/kotlin/org/utbot/examples/objects/HiddenFieldAccessModifiersTest.kt

@@ -7,7 +7,6 @@ import org.junit.jupiter.api.Test
 internal class HiddenFieldAccessModifiersTest : UtValueTestCaseChecker(testClass = HiddenFieldAccessModifiersExample::class) {
     @Test
     fun testCheckSuperFieldEqualsOne() {
-        // TODO: currently, codegen can't handle tests with field hiding (see #646)
         withEnabledTestingCodeGeneration(testCodeGeneration = false) {
             check(
                 HiddenFieldAccessModifiersExample::checkSuperFieldEqualsOne,

utbot-framework/src/test/kotlin/org/utbot/examples/objects/HiddenFieldExampleTest.kt

@@ -21,7 +21,6 @@ internal class HiddenFieldExampleTest : UtValueTestCaseChecker(testClass = Hidde
 
     @Test
     fun testCheckSuccField() {
-        // TODO: currently, codegen can't handle tests with field hiding (see #646)
         withEnabledTestingCodeGeneration(testCodeGeneration = false) {
             check(
                 HiddenFieldExample::checkSuccField,