fix: cancel button on create-workspace page wasn't redirecting correctly

[bryphe-coder]

Issue:

Pressing cancel on the create-workspace page would give an unexpected result:

Defect:

Originally, the project variable was being used for the project name - but then got refactored to keep the actual project data. However, the cancel button logic wasn't updated to take this into account - pushing an incorrect URL.

Fix:

Use the projectName variable, which we already extract for the router

[codecov]

Codecov Report

Merging #117 (02998f1) into main (515e55d) will increase coverage by 2.73%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   68.90%   71.63%   +2.73%     
==========================================
  Files          86       91       +5     
  Lines        3447     3670     +223     
  Branches       59       59              
==========================================
+ Hits         2375     2629     +254     
+ Misses        884      823      -61     
- Partials      188      218      +30     

Flag	Coverage Δ
unittest-go-macos-latest	67.96% <ø> (+0.17%)	⬆️
unittest-go-ubuntu-latest	69.77% <ø> (?)
unittest-go-windows-latest	67.44% <ø> (?)
unittest-js	74.72% <0.00%> (ø)

Impacted Files	Coverage Δ
...pages/projects/[organization]/[project]/create.tsx	0.00% <0.00%> (ø)
provisioner/terraform/parse.go	75.00% <0.00%> (ø)
provisioner/terraform/serve.go	66.66% <0.00%> (ø)
coderd/userpassword/userpassword.go	63.41% <0.00%> (ø)
database/postgres/postgres.go	70.00% <0.00%> (ø)
provisioner/terraform/provision.go	57.62% <0.00%> (ø)
peer/channel.go	84.75% <0.00%> (+0.60%)	⬆️
peer/conn.go	77.86% <0.00%> (+2.08%)	⬆️
coderd/coderdtest/coderdtest.go	100.00% <0.00%> (+22.64%)	⬆️
database/migrate.go	52.38% <0.00%> (+52.38%)	⬆️
... and 1 more

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