Revert "Replace a call to a deprecated method to update context with the new one."

This reverts commit 5f0d384c9e.

Introduced a bug where the system theme wasn't changing until app
restart.

app/src/main/java/org/thoughtcrime/securesms/util/dynamiclanguage/DynamicLanguageContextWrapper.java

@@ -20,7 +20,9 @@ public final class DynamicLanguageContextWrapper {
     final Configuration config    = resources.getConfiguration();
     final Configuration newConfig = copyWithNewLocale(config, newLocale);
 
-    return context.createConfigurationContext(newConfig);
+    resources.updateConfiguration(newConfig, resources.getDisplayMetrics());
+
+    return context;
   }
 
   private static Configuration copyWithNewLocale(Configuration config, Locale locale) {