Suspend call detector: fix delegated properties checking

idea/testData/inspectionsLocal/redundantSuspend/.inspection

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.inspections.RedundantSuspendModifierInspection

idea/testData/inspectionsLocal/redundantSuspend/getterDelegate.kt

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+// PROBLEM: none
+// WITH_RUNTIME
+
+import kotlin.reflect.KProperty
+
+<caret>suspend fun bar(): String {
+    val x: String by Delegate()
+    return x
+}
+
+class Delegate {
+    suspend operator fun getValue(thisRef: Any?, property: KProperty<*>): String = ""
+}

idea/testData/inspectionsLocal/redundantSuspend/setterDelegate.kt

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+// PROBLEM: none
+// WITH_RUNTIME
+
+import kotlin.reflect.KProperty
+
+<caret>suspend fun bar(): String {
+    var x: String by Delegate()
+    x = "Hello"
+    return x
+}
+
+class Delegate {
+    operator fun getValue(thisRef: Any?, property: KProperty<*>): String = ""
+
+    suspend operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {}
+}