[BUG] Database reader source XML tags casing is no longer all lowercase in 3.12.0

[pladesma]

Describe the bug
Using the Database Reader, the generated XML message used to always convert the result tags to lowercase. But in 3.12.0, it instead follows the casing that was provided by the SELECT statement.

To Reproduce

1. In a Database Reader, use Mirth Connect to generate a SELECT statement such as:
   SELECT MYTABLE.TESTID AS TESTID FROM MYTABLE
2. Then in the source transformer, let Mirth generate an inbound message template.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <result>
 <testid>value</testid>
 </result>

3. Use a message builder step to generate the following JS code
   tmp['row']['column1'] = validate(msg['testid'].toString(), '', new Array());
4. Deploy the channel. A message such as the following will be received:

<result>
 <TESTID>6221715</TESTID>
 </result>

Expected behavior
The resulting XML message should have lowercase tags.

Actual behavior
The resulting XML message follows the casing from the SELECT statement.

Environment (please complete the following information):

• OS: Linux
• Java 8
• Connect 3.12.0

Workaround(s)
Change the aliases in the SELECT statement to be all lowercase, i.e. SELECT MYTABLE.TESTID AS testid FROM MYTABLE

Additional Context
Relates to #4878