fix(title): remove default alignment and position

[orhun]

fixes #322

we already have defaults in:

https://github.com/tui-rs-revival/ratatui/blob/446efae185a5bb02a9ab6481542d1dc3024b66a9/src/widgets/block.rs#L151-L152

[codecov]

Codecov Report

Merging #323 (d74c362) into main (446efae) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head d74c362 differs from pull request most recent head 35bc456. Consider uploading reports for the commit 35bc456 to get more accurate results

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   85.00%   85.01%   +0.01%     
==========================================
  Files          38       40       +2     
  Lines        8507     8570      +63     
==========================================
+ Hits         7231     7286      +55     
- Misses       1276     1284       +8     

Impacted Files	Coverage Δ
src/title.rs	100.00% <100.00%> (ø)
src/widgets/block.rs	87.40% <100.00%> (+1.00%)	⬆️

... and 5 files with indirect coverage changes

[joshka]

Sensible change to me. Can you please write a test for this (in the block unit tests) that covers the bug mentioned in #322

[orhun]

Added test cases for both usages of alignment.