fix: :id placeholder in api command

[profclems]

Using :id placeholder in api command fails with Project Not Found.
This is caused by directly converting the int to rune before converting to string producing an ascii character (�)

This PR fixes this issue.

Related to #657 #663

[codecov]

Codecov Report

Merging #742 (9f21660) into trunk (a18cc9f) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##            trunk     #742   +/-   ##
=======================================
  Coverage   58.60%   58.60%           
=======================================
  Files          93       93           
  Lines        6663     6663           
=======================================
  Hits         3905     3905           
  Misses       2379     2379           
  Partials      379      379           

Impacted Files	Coverage Δ
commands/api/api.go	74.53% <0.00%> (ø)

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