Improve initializer fixit when there are no parameters and no body

[dfed]

We should ensure assignments are on their own line!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.90%. Comparing base (2227da8) to head (d567105).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files          32       32           
  Lines        3257     3258    +1     
=======================================
+ Hits         3254     3255    +1     
  Misses          3        3           

Files with missing lines	Coverage Δ
...ources/SafeDIMacros/Macros/InstantiableMacro.swift	100.00% <100.00%> (ø)

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[dfed]

Xcode will handle adding the correct indentation