Make Watch-app & -complication follow ConfigOverride.xcconfig

The main app name can be overriden by either changing it in XCode or, easier for all future us, put an entry in ConfigOverride.xcconfig to overrule it.

However, this currently only affects Trio's main target as the rest is hardcoded to "Trio" within this file instead of referencing $(APP_DISPLAY_NAME). So the Watch app and Complication get set to "Trio" and ignores the ConfigOverride value.

This minor change makes XCode also look at ConfigOverride.xcconfig for the Watch and Watch Complication targets. When the file isn't present or does not contain a line to override APP_DISPLAY_NAME, it defaults back to "Trio" as defined in Config.xcconfig. 

See comments for an additional remark.

Trio.xcodeproj/project.pbxproj

@@ -6147,7 +6147,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = "Trio Watch Complication/Info.plist";
-				INFOPLIST_KEY_CFBundleDisplayName = Trio;
+				INFOPLIST_KEY_CFBundleDisplayName = "$(APP_DISPLAY_NAME)";
 				INFOPLIST_KEY_NSHumanReadableCopyright = "";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -6184,7 +6184,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = "Trio Watch Complication/Info.plist";
-				INFOPLIST_KEY_CFBundleDisplayName = Trio;
+				INFOPLIST_KEY_CFBundleDisplayName = "$(APP_DISPLAY_NAME)";
 				INFOPLIST_KEY_NSHumanReadableCopyright = "";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -6221,7 +6221,7 @@
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
-				INFOPLIST_KEY_CFBundleDisplayName = Trio;
+				INFOPLIST_KEY_CFBundleDisplayName = "$(APP_DISPLAY_NAME)";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown";
 				INFOPLIST_KEY_WKCompanionAppBundleIdentifier = "$(BUNDLE_IDENTIFIER)";
 				LD_RUNPATH_SEARCH_PATHS = (
@@ -6258,7 +6258,7 @@
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GENERATE_INFOPLIST_FILE = YES;
-				INFOPLIST_KEY_CFBundleDisplayName = Trio;
+				INFOPLIST_KEY_CFBundleDisplayName = "$(APP_DISPLAY_NAME)";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown";
 				INFOPLIST_KEY_WKCompanionAppBundleIdentifier = "$(BUNDLE_IDENTIFIER)";
 				LD_RUNPATH_SEARCH_PATHS = (