[Installer]Revert ignore start menu shortcut on update (#19715)

This reverts commit 7f6c91e.

Co-authored-by: Jaime Bernardo <[email protected]>

Author: SeraphimaZykova

installer/PowerToysSetup/Product.wxs

@@ -599,7 +599,6 @@
 
     <DirectoryRef Id="ApplicationProgramsFolder">
       <Component Id="PowerToysStartMenuShortcut" >
-        <Condition>NOT PREVIOUSVERSIONSINSTALLED</Condition>
         <Shortcut Id="ApplicationStartMenuShortcut"
         Name="PowerToys (Preview)"
         Description="PowerToys - Windows system utilities to maximize productivity"