webui: Fix source map generation

Looks like we had the source map generation condition
backwards - so fix it & make sure to properly package
the resulting source map files.

This seems to add about 600 kB of (compressed) RPM size
and a bit more once installed.

But with the source files, Firefox seems to be finally able
to show the source code during debugging as well as pinpoint errors
from the debug tools console even if the actual code is still minified.

anaconda.spec.in

@@ -437,7 +437,9 @@ rm -rf \
 %{_datadir}/cockpit/anaconda-webui/index.css.LEGAL.txt
 %{_datadir}/cockpit/anaconda-webui/index.html
 %{_datadir}/cockpit/anaconda-webui/index.js.gz
+%{_datadir}/cockpit/anaconda-webui/index.js.map
 %{_datadir}/cockpit/anaconda-webui/index.css.gz
+%{_datadir}/cockpit/anaconda-webui/index.css.map
 %{_datadir}/cockpit/anaconda-webui/manifest.json
 %{_datadir}/metainfo/org.cockpit-project.anaconda-webui.metainfo.xml
 %{_datadir}/cockpit/anaconda-webui/po.*.js.gz

ui/webui/build.js

@@ -54,7 +54,7 @@ function watch_dirs(dir, on_change) {
 }
 
 const context = await esbuild.context({
- ...!production ? { sourcemap: "linked" } : {},
+ ...production ? { sourcemap: "linked" } : {},
  bundle: true,
  entryPoints: ["./src/index.js"],
  external: ['*.woff', '*.woff2', '*.jpg', '*.svg', '../../assets*'], // Allow external font files which live in ../../static/fonts