Added check to ensure anniversary theme is only applied once. (#501)

Author: DeadlyKitten

ModAssistant/App.config

@@ -47,6 +47,9 @@
             <setting name="SelectedTheme" serializeAs="String">
                 <value/>
             </setting>
+            <setting name="AppliedAnniversaryTheme" serializeAs="String">
+                <value>False</value>
+            </setting>
             <setting name="ReinstallInstalled" serializeAs="String">
                 <value>True</value>
             </setting>

ModAssistant/Classes/Themes.cs

@@ -115,8 +115,9 @@ public static void LoadThemes()
         /// <param name="savedTheme">Theme name retrieved from the settings file.</param>
         public static void FirstLoad(string savedTheme)
         {
-            if (DateTime.Now.Date.ToString("MM/yyyy") == "05/2023")
+            if (!Properties.Settings.Default.AppliedAnniversaryTheme && DateTime.Now.Date.ToString("MM/yyyy") == "05/2023")
             {
+                Properties.Settings.Default.AppliedAnniversaryTheme = true;
                 ApplyTheme("Anniversary", false);
                 return;
             }