Disable iPad-on-Mac builds in favour of Catalyst

Xcode warns that only one can be enabled at a time, so we need to pick
one, and Catalyst seems like the better option for a proper macOS app
experience.

Author: dpogue

templates/project/__PROJECT_NAME__.xcodeproj/project.pbxproj

@@ -327,6 +327,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "__PROJECT_ID__";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTS_MACCATALYST = YES;
+				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_WORKSPACE = NO;
 			};
@@ -351,6 +352,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "__PROJECT_ID__";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTS_MACCATALYST = YES;
+				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_WORKSPACE = NO;
 			};