refactor: Remove CodeXPUser from plugin.xml

Author: ByteAurora

src/main/resources/META-INF/plugin.xml

@@ -13,7 +13,6 @@
                     id="CodeXPToolWindow"/>
         <postStartupActivity implementation="com.github.ilovegamecoding.intellijcodexp.startup.CodeXPStartupActivity"/>
         <applicationService serviceImplementation="com.github.ilovegamecoding.intellijcodexp.core.CodeXP"/>
-        <applicationService serviceImplementation="com.github.ilovegamecoding.intellijcodexp.core.CodeXPUser"/>
         <applicationService serviceImplementation="com.github.ilovegamecoding.intellijcodexp.services.CodeXPService"/>
     </extensions>