[2.x] Fix Inertia redirect

[rennokki]

Closes #9

[codecov]

Codecov Report

Merging #11 (e9d4803) into 2.x (74954dd) will increase coverage by 0.42%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x      #11      +/-   ##
============================================
+ Coverage     88.70%   89.13%   +0.42%     
+ Complexity       53       52       -1     
============================================
  Files             7        7              
  Lines           186      184       -2     
============================================
- Hits            165      164       -1     
+ Misses           21       20       -1     

Impacted Files	Coverage Δ	Complexity Δ
src/Http/Controllers/Inertia/BillingController.php	100.00% <100.00%> (+11.11%)	2.00 <1.00> (-1.00)	⬆️

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