Fix app icon for older versions of macOS

Author: rxhanson

Rectangle.xcodeproj/project.pbxproj

@@ -1212,6 +1212,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_INCLUDE_ALL_APPICON_ASSETS = YES;
 				ASSETCATALOG_OTHER_FLAGS = "--enable-icon-stack-fallback-generation=disabled";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Rectangle/Rectangle.entitlements;
@@ -1243,6 +1244,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_INCLUDE_ALL_APPICON_ASSETS = YES;
 				ASSETCATALOG_OTHER_FLAGS = "--enable-icon-stack-fallback-generation=disabled";
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Rectangle/RectangleRelease.entitlements;