Fix inheritance printer output formatting

[ep0chzer0]

Summary

Fixes #1835

The inheritance printer was adding extraneous newline characters that caused inheritance information to be split across multiple lines when it should appear on a single line.

Before

+ Baz
 -> Bar, IBaz
, [Foo, IFoo]

After

+ Baz -> Bar, IBaz, [Foo, IFoo]

Changes

• Remove trailing \n from contract name lines (e.g., info += blue(f"\n+ {child.name}\n") → info += blue(f"\n+ {child.name}"))
• Remove trailing \n from inheritance arrow lines
• Remove trailing \n from not_immediate bracket lines
• Remove trailing \n from section headers

Additional Fix

Also fixes a bug where base_to_child[base.name]["not_immediate"] was incorrectly populated with immediate values instead of not_immediate values.

Test Plan

• Run slither test.sol --print inheritance with the test contract from the issue
• Verify output is on single lines per contract

🤖 Generated with Claude Code

[ep0chzer0]

Hello maintainers! This is a simple fix for the inheritance printer output formatting issue. The extra newline characters were causing output to be split across lines incorrectly. Could you please approve the CI workflows to run? Thank you!