Cleanup: KotlinLineMarkerProvider

idea/testData/codeInsight/lineMarker/overrideImplement/PropertyOverride.kt

@@ -1,7 +1,7 @@
-open class <lineMarker></lineMarker>Base {
-  open var <lineMarker></lineMarker>writable: Int = 12
+open class <lineMarker>Base</lineMarker> {
+  open var <lineMarker>writable</lineMarker>: Int = 12
 }
 
 class SubBase: Base() {
-  override var <lineMarker></lineMarker>writable: Int = 42
+  override var <lineMarker>writable</lineMarker>: Int = 42
 }