Revert to auto signing (#2158)

Task/Issue URL: https://app.asana.com/0/0/1205948248159064/f

Description:

I accidentally committed fastlane signing. This reverts that.

DuckDuckGo.xcodeproj/project.pbxproj

@@ -8103,7 +8103,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = "$(APP_ID)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				"PROVISIONING_PROFILE_SPECIFIER[sdk=iphoneos*]" = "match Development com.duckduckgo.mobile.ios";
+				"PROVISIONING_PROFILE_SPECIFIER[sdk=iphoneos*]" = "Development - App";
 				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;