don't remove sidebar_action in chromium builds (for Opera users)

build-extension.sh

@@ -2,6 +2,6 @@
 rm singlefile-extension-firefox.zip singlefile-extension-chromium.zip
 zip -r singlefile-extension-firefox.zip manifest.json extension lib _locales
 cp manifest.json manifest.copy.json
-jq "del(.applications,.sidebar_action,.permissions[0],.options_ui.browser_style)" manifest.copy.json > manifest.json
+jq "del(.applications,.permissions[0],.options_ui.browser_style)" manifest.copy.json > manifest.json
 zip -r singlefile-extension-chromium.zip manifest.json extension lib _locales
 mv manifest.copy.json manifest.json