fix(nocodb): Fixed filtering boolean visual bug

[nith2001]

Change Summary

See Issue #5648 for context. The changes I made should fix that and remove the dropdown from appearing on the first issue, thereby reducing confusion on why there's a boolean operator selector at the front of the filtering UI.

Change type

• feat: (new feature for the user, not a new feature for build script)
• fix: (bug fix for the user, not a fix to a build script)
• docs: (changes to the documentation)
• style: (formatting, missing semi colons, etc; no production code change)
• refactor: (refactoring production code, eg. renaming a variable)
• test: (adding missing tests, refactoring tests; no production code change)
• chore: (updating grunt tasks etc; no production code change)

Test/ Verification

When adding a filter group, this is what it looks like:

Let's say I added a filter at the bottom of the filter group (or filter) and then deleted the top filter. The "Where" word will automatically update.

Before deleting top filter group:

After deleting top filter group:

This applies to the nested ones as well.

Additional information / screenshots (optional)

Anything for maintainers to be made aware of

[nith2001]

@dstala Could you review my PR?

[nith2001]

Let's goooooo, thank you!