Fix issue where title was always returning null

[slightfoot]

Description

jaspr_router was not returning the page title. Looks like a refactor didnt catch the type change of r to RouteMatch instead of Route. Have added typed paramaters to deter this from happening again, and resolved bug by referring to the inner route.

Type of Change

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 Code refactor
• [ ] 📝 Documentation
• [ ] 🗑️ Chore

Ready Checklist

• [x] I've read the Contribution Guide.
• [x] In case this PR changes one of the core packages, I've modified the respective CHANGELOG.md file using the semantic_changelog format.
• [x] I updated/added relevant documentation (doc comments with ///).

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docs.page/schultek/jaspr~110

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[github-actions[bot]]

Package Version Report

The following packages have been updated: jaspr_router : 0.2.3 -> 0.2.4

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% :tada:

Comparison is base (b19bd9b) 66.53% compared to head (a0b5204) 66.57%. Report is 18 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #110 +/- ## ========================================== + Coverage 66.53% 66.57% +0.04% ========================================== Files 96 96 Lines 3798 3803 +5 ========================================== + Hits 2527 2532 +5 Misses 1271 1271 ``` | [Files Changed](https://app.codecov.io/gh/schultek/jaspr/pull/110?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kilian+Schulte) | Coverage Δ | | |---|---|---| | [packages/jaspr/lib/src/browser/dom\_renderer.dart](https://app.codecov.io/gh/schultek/jaspr/pull/110?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kilian+Schulte#diff-cGFja2FnZXMvamFzcHIvbGliL3NyYy9icm93c2VyL2RvbV9yZW5kZXJlci5kYXJ0) | `68.80% <100.00%> (+0.25%)` | :arrow_up: | | [packages/jaspr\_router/lib/src/matching.dart](https://app.codecov.io/gh/schultek/jaspr/pull/110?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kilian+Schulte#diff-cGFja2FnZXMvamFzcHJfcm91dGVyL2xpYi9zcmMvbWF0Y2hpbmcuZGFydA==) | `85.88% <100.00%> (+0.69%)` | :arrow_up: |

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