Update sizes

Author: github-actions[bot]

vcmi-1.7.json

@@ -382,7 +382,7 @@
 				"https://raw.githubusercontent.com/vcmi-mods/preserve-town/main/screenshots/screen5.png",
 				"https://raw.githubusercontent.com/vcmi-mods/preserve-town/main/screenshots/screen6.png"
 			],
-			"downloadSize" : 21.539
+			"downloadSize" : 21.54
 		},
 		"abyss-town" : {
 			"mod" : "https://raw.githubusercontent.com/vcmi-mods/abyss-town/vcmi-1.6/abyss-town/mod.json",