ios: rename variables cameraPicker to cdvUIImagePickerController#950

GitToTheHub merged 2 commits intomasterapache/cordova-plugin-camera:masterfrom

pr-ios-rename-variables-cameraPicker-to-cdvUIImagePickerControllerapache/cordova-plugin-camera:pr-ios-rename-variables-cameraPicker-to-cdvUIImagePickerControllerCopy head branch name to clipboard