Address one other Cocoa binding.

Required to be @objc to be visible from Swift in Swift 4.

PiperOrigin-RevId: 186015593

src/Tulsi/ConfigEditorBuildTargetSelectorViewController.swift

diff --git a/src/Tulsi/ConfigEditorBuildTargetSelectorViewController.swift b/src/Tulsi/ConfigEditorBuildTargetSelectorViewController.swift
index 840e2d7..c336f01 100644
--- a/src/Tulsi/ConfigEditorBuildTargetSelectorViewController.swift
+++ b/src/Tulsi/ConfigEditorBuildTargetSelectorViewController.swift
@@ -49,7 +49,7 @@
   @objc dynamic let typeFilter: NSPredicate? = NSPredicate.init(format: "(SELF.type IN %@) OR (SELF.selected == TRUE)",
                                                           argumentArray: [filteredFileTypes])
 
-  var selectedRuleInfoCount: Int = 0 {
+  @objc var selectedRuleInfoCount: Int = 0 {
     didSet {
       presentingWizardViewController?.setNextButtonEnabled(selectedRuleInfoCount > 0)
     }