WEB: Update link to macOS package

A new macOS package was generated to fix support for
macOS 10.7 and 10.8. The previous package was broken
on those system due to SDL not having been compiled
properly to support those.

data/downloads.xml

@@ -99,7 +99,7 @@
 -->
 				<file>
 					<category_icon>catpl-macos.png</category_icon>
-					<url>scummvm-{$release}-macosx.dmg</url>
+					<url>scummvm-{$release}.1-macosx.dmg</url>
 					<name>macOS 10.7+ 64 bits with Sparkle Disk Image</name>
 					<user_agent>Macintosh</user_agent>
 				</file>