Update themes.json

no special characters in theme name

themes.json

@@ -100,7 +100,7 @@
 		"css": {},
 		"javascript": {}
 	},
-	"Plex Theme - theme-park": {
+	"Plex Theme theme park": {
 		"author": "GilbN",
 		"category": "Community",
 		"description": "A Plex colored theme for Organizr ",
@@ -124,7 +124,7 @@
 		"css": {},
 		"javascript": {}
 	},
-	"Dark Theme - theme-park": {
+	"Dark Theme theme park": {
 		"author": "GilbN",
 		"category": "Community",
 		"description": "A dark radial gradient colored theme for Organizr ",