Fix #7247 About incorrect variable substitution with the query command

Fix #7247 About incorrect variable substitution with the query command

Description:
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The following query.sql file was generating an incorrect SQL command

# 1
:Query to test substitutions
*Enter a
*Enter b
*Enter c
SELECT '%1' as "a", '%2' as "b", '%3' as "c", '%1' as "a", '%2' as "b", '%3' as "c";

Workaround:
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Do not reuse variable in the SQL command (add a new one) or tweak SQL to not reuse variables.