Addon Manager: Fix score pref path

src/Mod/AddonManager/AddonManager.py

@@ -675,8 +675,8 @@ class CommandAddonManager:
 
     def fetch_addon_score(self) -> None:
         """Fetch the Addon score JSON data from a URL"""
-        pref = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Addons")
-        url = pref.GetString("AddonsScoreURL", "NONE")
+        prefs = fci.Preferences()
+        url = prefs.get("AddonsScoreURL")
         if url and url != "NONE":
             self.get_addon_score_worker = GetAddonScoreWorker(
                 url, self.item_model.repos, self.dialog

src/Mod/AddonManager/AddonManagerOptions.ui

@@ -334,13 +334,13 @@ installed addons will be checked for available updates
         </sizepolicy>
        </property>
        <property name="prefEntry" stdset="0">
-        <cstring>AddonScoreURL</cstring>
+        <cstring>AddonsScoreURL</cstring>
        </property>
        <property name="prefPath" stdset="0">
         <cstring>Addons</cstring>
        </property>
        <property name="toolTip">
-        <string>The URL for the Addon Score data (see documentation for formatting and hosting details).</string>
+        <string>The URL for the Addon Score data (see Addon Manager wiki page for formatting and hosting details).</string>
        </property>
       </widget>
      </item>

src/Mod/AddonManager/addonmanager_preferences_defaults.json

@@ -3,6 +3,7 @@
         "https://raw.githubusercontent.com/FreeCAD/FreeCAD-addons/master/addonflags.json",
     "AddonsRemoteCacheURL": "https://addons.freecad.org/metadata.zip",
     "AddonsStatsURL": "https://freecad.org/addon_stats.json",
+    "AddonsScoreURL": "NONE",
     "AutoCheck": false,
     "BlockedMacros": "BOLTS,WorkFeatures,how to install,documentation,PartsLibrary,FCGear",
     "CompositeSplitterState": "",