KTIJ-650 [Code completion]: no "sealed" for classes with modifiers

annotation, data, enum, inner, open - classes supplied with these
modifiers cannot be sealed.

Commit fixes code completion - "sealed" is no longer suggested in
the mentioned case.

idea/idea-completion/testData/keywords/SealedForAlreadySealed.kt

@@ -0,0 +1,4 @@
+seal<caret> sealed class A
+// ABSENT: "sealed"
+// ABSENT: "sealed class"
+// ABSENT: "sealed interface"

idea/idea-completion/testData/keywords/SealedForAnnotationClass.kt

@@ -0,0 +1,4 @@
+seal<caret> annotation class A
+// ABSENT: "sealed"
+// ABSENT: "sealed class"
+// ABSENT: "sealed interface"

idea/idea-completion/testData/keywords/SealedForDataClass.kt

@@ -0,0 +1,2 @@
+seal<caret> data class A(val f: Int)
+// ABSENT: "sealed"

idea/idea-completion/testData/keywords/SealedForEnumClass.kt

@@ -0,0 +1,2 @@
+seal<caret> enum class A
+// ABSENT: "sealed"

idea/idea-completion/testData/keywords/SealedForFunInterface.kt

@@ -0,0 +1,6 @@
+seal<caret> fun interface A {
+    fun aFunction()
+}
+
+// EXIST: "sealed"
+// NOTHING_ELSE

idea/idea-completion/testData/keywords/SealedForInnerClass.kt

@@ -0,0 +1,4 @@
+class A {
+    seal<caret>inner class B
+}
+// ABSENT: "sealed"

idea/idea-completion/testData/keywords/SealedForOpenClass.kt

@@ -0,0 +1,2 @@
+seal<caret> open class A
+// ABSENT: "sealed"