Fixes of two formatting issues with types defined inside REPL

[kindermannhubert]

Fixes #287. Fixes #305.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (f5af0da) 77.5% compared to head (89617fc) 77.5%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #306 +/- ## ===================================== Coverage 77.5% 77.5% ===================================== Files 83 83 Lines 5573 5575 +2 Branches 733 735 +2 ===================================== + Hits 4324 4326 +2 Misses 982 982 Partials 267 267 ``` | [Files](https://app.codecov.io/gh/waf/CSharpRepl/pull/306?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Will+Fuqua) | Coverage Δ | | |---|---|---| | [...pl.Services/Roslyn/Formatting/TypeNameFormatter.cs](https://app.codecov.io/gh/waf/CSharpRepl/pull/306?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Will+Fuqua#diff-Q1NoYXJwUmVwbC5TZXJ2aWNlcy9Sb3NseW4vRm9ybWF0dGluZy9UeXBlTmFtZUZvcm1hdHRlci5jcw==) | `88.7% <100.0%> (+0.1%)` | :arrow_up: |

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