fix: respects DarkMode in CountryTableView

Author: matheusmatos

FirebasePhoneAuthUI/Sources/Resources/FUICountryTableViewController.xib

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14835.7" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" colorMatched="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="21701" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" colorMatched="YES">
     <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14790.5"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="21678"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
@@ -20,14 +20,13 @@
             <subviews>
                 <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="hg9-yI-N8Q">
                     <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
-                    <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                    <color key="backgroundColor" systemColor="systemBackgroundColor"/>
                     <connections>
                         <outlet property="dataSource" destination="-1" id="PfW-Z4-lXH"/>
                         <outlet property="delegate" destination="-1" id="8PV-om-trg"/>
                     </connections>
                 </tableView>
             </subviews>
-            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
             <constraints>
                 <constraint firstItem="hg9-yI-N8Q" firstAttribute="top" secondItem="YSO-gq-Bsm" secondAttribute="top" id="3HS-x1-e0t"/>
                 <constraint firstAttribute="bottom" secondItem="hg9-yI-N8Q" secondAttribute="bottom" id="5uY-yC-Sbi"/>
@@ -37,4 +36,9 @@
             <point key="canvasLocation" x="355.07246376811599" y="6.6964285714285712"/>
         </view>
     </objects>
+    <resources>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+    </resources>
 </document>