Fix replacedBaseClause for selector which has implicit receiver

#KT-19666 Fixed

idea/testData/intentions/branched/ifThenToElvis/kt19666.kt

@@ -0,0 +1,13 @@
+// WITH_RUNTIME
+interface Taggable {
+    val tag: String
+}
+
+fun Any.log() {
+    val tag = <caret>if (this is Taggable) {
+        tag
+    }
+    else {
+        this::class.java.simpleName
+    }
+}

idea/testData/intentions/branched/ifThenToElvis/kt19666.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+interface Taggable {
+    val tag: String
+}
+
+fun Any.log() {
+    val tag = (this as? Taggable)?.tag ?: this::class.java.simpleName
+}