Changes to Addon First Run Dialog (#17518)

* Changes to Addon First Run Dialog

Updated Addon Manager first run dialog as per issue no. #17317

* Incorporated review comments

* Update src/Mod/AddonManager/addonmanager_preferences_defaults.json

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Update src/Mod/AddonManager/addonmanager_preferences_defaults.json

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

* Removed default assigns as requested

* Defaults updated

---------

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

src/Mod/AddonManager/addonmanager_preferences_defaults.json

@@ -26,7 +26,7 @@
     "MacroGitURL": "https://github.com/FreeCAD/FreeCAD-Macros",
     "MacroUpdateStatsURL": "https://addons.freecad.org/macro_update_stats.json",
     "MacroWikiURL": "https://wiki.freecad.org/Macros_recipes",
-    "NoProxyCheck": "",
+    "NoProxyCheck": true,
     "PackageTypeSelection": 0,
     "PrimaryAddonsSubmoduleURL":
         "https://raw.githubusercontent.com/FreeCAD/FreeCAD-addons/master/.gitmodules",
@@ -35,9 +35,9 @@
     "SelectedAddon": "",
     "ShowBranchSwitcher": false,
     "StatusSelection": 0,
-    "SystemProxyCheck": "",
+    "SystemProxyCheck": false,
     "UpdateFrequencyComboEntry": 0,
-    "UserProxyCheck": "",
+    "UserProxyCheck": false,
     "ViewStyle": 1,
     "WindowHeight": 600,
     "WindowWidth": 800,