fix(developer): prevent xmlns for LDML keyboard template child elements

[mcdurdin]

Fixes #11228.

User Testing

• TEST_NEW_PROJECT: Please rerun the steps reported in bug(developer): An LDML error occurs after compiling an LDML keyboard  #11228, and verify that you can now compile the new LDML keyboard successfully.

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ✅ TEST_NEW_PROJECT (PASSED): Tested with the attached PR build (Keyman Developer 17.0.310-beta-test-11251) on Windows 11 OS (VM) and here is my observation: 1. Retested issue 11228 with the new build and I was not able to reproduce it. 2. It seems to be working fine with the new build. Thanks. (notes)

Test Artifacts

• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• Keyboards
  • Test Keyboards

[bharanidharanj]

Test Results

• TEST_NEW_PROJECT (PASSED): Tested with the attached PR build (Keyman Developer 17.0.310-beta-test-11251) on Windows 11 OS (VM) and here is my observation: 1. Retested issue 11228 with the new build and I was not able to reproduce it. 2. It seems to be working fine with the new build. Thanks.

  

[darcywong00]

lgtm

[keyman-server]

Changes in this pull request will be available for download in Keyman version 17.0.312-beta