[Wi-Fi] Fix hint text color contrast problem in 'Add networks'

To raise hint text color, set android:attr/textColorSecondary
to android:textColorHint.

Bug: 146908018
Test: accessibility scanner
Change-Id: Id2525c1a0fc0b3f95298d493e2dc69b91aa13d77
diff --git a/res/layout/wifi_dialog.xml b/res/layout/wifi_dialog.xml
index a3ad4207..18ad3b5 100644
--- a/res/layout/wifi_dialog.xml
+++ b/res/layout/wifi_dialog.xml
@@ -470,7 +470,7 @@
                     <EditText android:id="@+id/proxy_pac"
                             android:layout_width="match_parent"
                             android:layout_height="wrap_content"
-                            style="@style/wifi_item_content"
+                            style="@style/wifi_item_edit_content"
                             android:hint="@string/proxy_url_hint"
                             android:inputType="textNoSuggestions"
                             android:singleLine="true"/>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 85b25e4..b2abb4c 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -144,8 +144,9 @@
     <style name="wifi_item_edit_content">
         <item name="android:paddingStart">4dip</item>
         <item name="android:layout_marginStart">4dip</item>
-        <item name="android:textSize">18sp</item>
         <item name="android:textAlignment">viewStart</item>
+        <item name="android:textAppearance">@android:style/TextAppearance.DeviceDefault.Medium</item>
+        <item name="android:textColorHint">?android:attr/textColorSecondary</item>
         <item name="android:minHeight">@dimen/min_tap_target_size</item>
     </style>