Fix EA-207101: Abort changing property declaration from Java accessor

This is not a proper fix. "Change signature" in Kotlin should support
  changing property name/type through accessors. However, it's not
  easy to achieve without a huge refactoring.

idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignatureUsageProcessor.kt

@@ -995,8 +995,12 @@ class KotlinChangeSignatureUsageProcessor : ChangeSignatureUsageProcessor {
                     baseFunction = baseFunction.createPrimaryConstructorIfAbsent()
                 }
                 val resolutionFacade = baseFunction.getResolutionFacade()
-                val baseFunctionDescriptor = baseFunction.unsafeResolveToDescriptor() as FunctionDescriptor
-                val methodDescriptor = KotlinChangeSignatureData(baseFunctionDescriptor, baseFunction, listOf(baseFunctionDescriptor))
+                val baseCallableDescriptor = baseFunction.unsafeResolveToDescriptor() as CallableDescriptor
+                if (baseCallableDescriptor !is FunctionDescriptor) {
+                    return false
+                }
+
+                val methodDescriptor = KotlinChangeSignatureData(baseCallableDescriptor, baseFunction, listOf(baseCallableDescriptor))
 
                 val dummyClass = JavaPsiFacade.getElementFactory(method.project).createClass("Dummy")
                 val dummyMethod = createJavaMethod(method, dummyClass)