fix: resolve relative paths to staged files

This fixes instances where there are staged changes, but they aren't
picked up with using the `--staged` flag.

After moving to gathering files with absolute paths, we must construct
absolute paths for the files reported as changed by Git that were listed
as relative.

src/utils/files.js

@@ -145,7 +145,10 @@ const stagedFiles = (files = []) => {
     const output = result.stdout.trim()
 
     if (output) {
-        const staged = output.split('\n')
+        const staged = output
+            .split('\n')
+            .map(f => path.resolve(CONSUMING_ROOT, f))
+
         return files.filter(f => staged.includes(f))
     }