CI: lint fuzz as part of the main lint job.

The previous state was a leftover from when linting was part of the
build job.

.github/workflows/ci.yml

@@ -317,7 +317,7 @@ jobs:
       run: cargo build --package xtask
 
     - name: Lint
-      run: cargo xtask --scope=only-normal lint --timings
+      run: cargo xtask --scope=all lint --timings
 
     - run: df -h .
 
@@ -538,10 +538,6 @@ jobs:
         path: |
           fuzz/corpus
 
-    - name: Lint
-      # We run lint because otherwise the fuzz code won't get linted.
-      run: cargo xtask --scope=only-fuzz lint
-
     - name: Fuzz
       # Note: The specified timeout value is per-fuzz-target; as of this writing
       # there are 6 fuzz targets and so the total time will be 720 seconds = 12 minutes.