Convert to scope function: enable on single function call

#KT-29099 Fixed

idea/testData/intentions/convertToScope/convertToApply/callExpression5.kt

@@ -1,5 +1,4 @@
 // WITH_RUNTIME
-// IS_APPLICABLE: false
 
 class Foo {
     fun foo(i: Int) {}
@@ -7,6 +6,7 @@ class Foo {
     fun test(f: Foo) {
         val f = Foo()<caret>
         f.foo(1)
+        f.foo(2)
         bar(2, this)
     }
 }

idea/testData/intentions/convertToScope/convertToApply/callExpression5.kt.after

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+
+class Foo {
+    fun foo(i: Int) {}
+
+    fun test(f: Foo) {
+        val f = Foo().apply {
+            foo(1)
+            foo(2)
+        }
+        bar(2, this)
+    }
+}
+
+fun bar(i: Int, f: Foo) {}

idea/testData/intentions/convertToScope/convertToApply/singleCall.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C()
+    c.foo()<caret>
+}

idea/testData/intentions/convertToScope/convertToApply/singleCall.kt.after

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+
+class C {
+    fun foo() {}
+}
+
+fun test() {
+    val c = C().apply {
+        foo()
+    }
+}