docs(startup): correct the rationale for the deferred server start

The comment justified deferring btnStartClick by the taskbar-proxy exposure
window, which the .dpr fix has since removed. Kept as-is per decision — it
works and reaching the tray sooner is desirable — but the comment now says
that, so nobody "fixes" it later against a premise that no longer holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

delphi-backend/PMServer.dproj

@@ -204,7 +204,6 @@ $(PreBuildEvent)]]></PreBuildEvent>
         <Icon_MainIcon>PMServer_Icon1.ico</Icon_MainIcon>
         <UWP_DelphiLogo44>app.png</UWP_DelphiLogo44>
         <UWP_DelphiLogo150>app.png</UWP_DelphiLogo150>
-        <Debugger_RunParams>-tray</Debugger_RunParams>
     </PropertyGroup>
     <ItemGroup>
         <DelphiCompile Include="$(MainSource)">