fix: set correct prop name

Author: gabrieloliveirapinto

frontend/express/public/javascripts/countly/vue/components/content.js

@@ -80,11 +80,6 @@
                 type: Array
             },
 
-            titleMaxLength: {
-                default: 50,
-                type: Number
-            },
-
             toggle: {
                 default: false,
                 type: Boolean
@@ -104,6 +99,11 @@
                 type: String
             },
 
+            valueMaxLength: {
+                default: 50,
+                type: Number
+            },
+
             version: {
                 default: null,
                 type: String