Add comment to include noblacklist ${RUNUSER}/app in browser profiles

KeePassXC browser extension look for KeePassXC in the /run/user/app directory (https://github.com/keepassxreboot/keepassxc/blob/6b1ab1a5edd66ac10706a2fb5af34ec9458a901d/src/browser/BrowserShared.cpp\#L41). Unfortunately, /run/user/app seems to be blacklisted in disable-common.inc under the flatpak section (https://github.com/netblue30/firejail/blob/b89ec818926b4bcd3a58bb4e2a67b68a8090ba1c/etc/inc/disable-common.inc\#L667), as a result, KeePassXC extension cannot connect to it.

etc/profile-a-l/chromium-common.profile

@@ -46,5 +46,11 @@ blacklist ${PATH}/wget2
 # The file dialog needs to work without d-bus.
 ?HAS_NODBUS: env NO_CHROME_KDE_FILE_DIALOG=1
 
+# Add one of the following whitelist options to your chromium-common.local to enable KeePassXC Plugin support.
+# Note: Start KeePassXC before chromium or google-chrome and keep it open to allow communication between them.
+#whitelist ${RUNUSER}/kpxc_server
+#whitelist ${RUNUSER}/org.keepassxc.KeePassXC.BrowserServer
+#noblacklist ${RUNUSER}/app
+
 # Redirect
 include blink-common.profile

etc/profile-a-l/firefox.profile

@@ -33,6 +33,7 @@ whitelist ${HOME}/.mozilla
 # Note: Start KeePassXC before Firefox and keep it open to allow communication between them.
 #whitelist ${RUNUSER}/kpxc_server
 #whitelist ${RUNUSER}/org.keepassxc.KeePassXC.BrowserServer
+#noblacklist ${RUNUSER}/app
 
 whitelist /usr/share/firefox
 whitelist /usr/share/gnome-shell/search-providers/firefox-search-provider.ini