[CMake] Fix typo in Windows installation step

Follows up on 3b2ce69, where I accidentally wrote `.ps2` instead of
`.ps1` in one place.

Author: guitargeek

cmake/modules/RootConfiguration.cmake

@@ -752,7 +752,7 @@ if(WIN32)
   if(thisroot_scripts)
     configure_file(${CMAKE_SOURCE_DIR}/config/thisroot.bat ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/thisroot.bat @ONLY)
     configure_file(${CMAKE_SOURCE_DIR}/config/thisroot.ps1 ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/thisroot.ps1 @ONLY)
-    list(APPEND list_of_thisroot_scripts thisroot.bat thisroot.ps2)
+    list(APPEND list_of_thisroot_scripts thisroot.bat thisroot.ps1)
   endif()
   configure_file(${CMAKE_SOURCE_DIR}/config/root.rc.in ${CMAKE_BINARY_DIR}/etc/root.rc @ONLY)
   configure_file(${CMAKE_SOURCE_DIR}/config/root-manifest.xml.in ${CMAKE_BINARY_DIR}/etc/root-manifest.xml @ONLY)