Update system sms templates

[RushanNanayakkara]

Purpose

Currently SMS templates are not being applied to any sms notifications.
With the introduction of the SMS Templating feature we need to retain the current default behaviour.
This PR updates the system sms templates to only include the relevant values as if the templates are not applied.

Related Issue

• SMS Templates not being applied to SMS notifications wso2/product-is#21620

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.11%. Comparing base (5cba885) to head (3f3778e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #281   +/-   ##
=========================================
  Coverage     17.11%   17.11%           
  Complexity      180      180           
=========================================
  Files            53       53           
  Lines          3027     3027           
  Branches        332      332           
=========================================
  Hits            518      518           
  Misses         2467     2467           
  Partials         42       42           

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