Update TsqlTools-SQLcompare-RowsCompare.sql

[Imran-imtiaz48]

Improvements Made:

1. Consistent Variable Naming: Used PascalCase for variable names for consistency.
2. Initialization: Combined variable declaration and assignment where possible.
3. Logic Enhancement: Streamlined the construction of SQL queries and cursor usage.
4. Readability: Improved formatting and comments for better readability and maintenance.