Windows: Update krita-nsis to v1.2.4b

Changelog:
- Add Krita to the Open With list for other common image formats
  [alvinhochun/KritaShellExtension#15]
- Build shell extension with debug info
  [alvinhochun/KritaShellExtension#16]

CCBUG: 389650

packaging/windows/MakeInstallerNsis.cmake.in

@@ -104,9 +104,9 @@ message(STATUS "Downloading NSIS script package...")
 if(EXISTS "${CMAKE_CURRENT_BINARY_DIR}/krita-nsis")
     file(REMOVE_RECURSE "${CMAKE_CURRENT_BINARY_DIR}/krita-nsis")
 endif()
-file(DOWNLOAD "https://github.com/alvinhochun/KritaShellExtension/releases/download/v1.2.4a/krita-nsis-v1.2.4a_krita4.zip"
+file(DOWNLOAD "https://github.com/alvinhochun/KritaShellExtension/releases/download/v1.2.4b/krita-nsis-v1.2.4b.zip"
     "${DOWNLOAD_DIR}/krita-nsis.zip"
-    EXPECTED_HASH SHA1=fc389a1857327d10b760633ab721255d0034f31e
+    EXPECTED_HASH SHA1=43c5bade13fb885e8546dac4486b8e2df62dc692
 )
 execute_process(COMMAND ${CMAKE_COMMAND} -E tar xfz "${DOWNLOAD_DIR}/krita-nsis.zip"
     WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"