(CAT-2413) Update install_powershell.ps1 to generate the correct link

As it stands the download link generated is missing the type variable and as such is considered invalid.
This is likely a remnant of when the agent was the only product hosted on the site.

Author: david22swan

tasks/install_powershell.ps1

@@ -131,7 +131,7 @@ if ($absolute_source) {
     } else {
         $dev = ''
     }
-    $msi_source = "${windows_source}?version=${version}&os_name=windows&os_version=${major_os_version}&os_arch=${arch}&fips=${fips}${dev}"
+    $msi_source = "${windows_source}?type=native&version=${version}&os_name=windows&os_version=${major_os_version}&os_arch=${arch}&fips=${fips}${dev}"
 } else {
     $msi_source = "$windows_source/windows/${collection}/${msi_name}"
 }