Patch for SonarQube fixes.

Hi Team,

I have fixed a few sonarQube issues, PFA patch
Details as follows:

1. Preferences:

- Refactor this function to reduce its Cognitive Complexity from 18 to
the 15 allowed.
- Merge this if statement with the enclosing one.
- Define a constant instead of duplicating this literal 'tab settings' 5
times.

2. Connection:

- Remove this unneeded "pass".

3. Sqleditor:

- Remove this useless assignment to variable "msgDiv".

4. Debugger:

- Review this useless assignment: "index" already holds the assigned
value along all execution paths.
- 'label' is already declared in the upper scope.
- 'label' is already declared in the upper scope.
- 'browser_preferences' is already declared in the upper scope.

5. FileManager:

- 'path' is already declared in the upper scope.

--
*Thanks & Regards,*
*Nikhil Mohite*
*Software Engineer.*
*EDB Postgres* <https://www.enterprisedb.com/>
*Mob.No: +91-7798364578.*