appview/pages: fix regression in blob view that removed scroll

Signed-off-by: oppiliappan <[e-mail]>

.air/knot.toml

···
 [build]
 cmd = 'go build -ldflags "-X tangled.org/core/knotserver.version=$(git describe --tags --long)" -o out/knot.out cmd/knot/main.go'
 bin = "out/knot.out"
-args_bin = "server"
+args_bin = ["server"]
 
 include_ext = ["go"]
 exclude_dir = ["avatar", "camo", "indexes", "nix", "tmp"]

appview/pages/templates/repo/blob.html

···
         {{ end }}
       </div>
     {{ else if .BlobView.ContentType.IsCode }}
-      <div id="blob-contents" class="whitespace-pre peer-target:bg-yellow-200 dark:peer-target:bg-yellow-900">{{ code .BlobView.Contents .Path | escapeHtml }}</div>
+      <div class="overflow-auto relative">
+        <div id="blob-contents" class="whitespace-pre peer-target:bg-yellow-200 dark:peer-target:bg-yellow-900">{{ code .BlobView.Contents .Path | escapeHtml }}</div>
+      </div>
     {{ end }}
     {{ template "fragments/multiline-select" }}
 {{ end }}