LaunchServer+Base: Stop using Browser as default protocol handler

Browser supports very few protocols (http, https, gemini, file) at the
moment, so there's no point in using it as a catch-all and default
protocol handler. I added an explicit association for gemini to
/bin/Browser instead.

This stops Desktop::Launcher::open() from reporting success for any URL,
which really isn't the case (Browser shows an error page...).

Base/home/anon/.config/LaunchServer.ini

@@ -15,7 +15,7 @@ sheets=/bin/Spreadsheet
 *=/bin/TextEditor
 
 [Protocol]
-irc=/bin/IRCClient
+gemini=/bin/Browser
 http=/bin/Browser
 https=/bin/Browser
-*=/bin/Browser
+irc=/bin/IRCClient

Base/res/apps/Browser.af

@@ -9,4 +9,4 @@ Category=Internet
 
 [Launcher]
 FileTypes=html,htm,md
-Protocols=http,https
+Protocols=gemini,http,https

Services/LaunchServer/Launcher.cpp

@@ -196,7 +196,7 @@ bool Launcher::open_url(const URL& url, const String& handler_name)
  if (url.protocol() == "file")
  return open_file_url(url);
 
- return open_with_user_preferences(m_protocol_handlers, url.protocol(), url.to_string(), "/bin/Browser");
+ return open_with_user_preferences(m_protocol_handlers, url.protocol(), url.to_string());
 }
 
 bool Launcher::open_with_handler_name(const URL& url, const String& handler_name)
@@ -252,9 +252,11 @@ bool Launcher::open_with_user_preferences(const HashMap<String, String>& user_pr
  if (program_path.has_value())
  return spawn(program_path.value(), argument);
 
- // Absolute worst case, try the provided default
+ // Absolute worst case, try the provided default program, if any
+ if (!default_program.is_empty())
+ return spawn(default_program, argument);
 
- return spawn(default_program, argument);
+ return false;
 }
 
 void Launcher::for_each_handler(const String& key, HashMap<String, String>& user_preference, Function<bool(const Handler&)> f)

Services/LaunchServer/Launcher.h

@@ -72,7 +72,7 @@ class Launcher {
  void for_each_handler(const String& key, HashMap<String, String>& user_preferences, Function<bool(const Handler&)> f);
  void for_each_handler_for_path(const String&, Function<bool(const Handler&)> f);
  bool open_file_url(const URL&);
- bool open_with_user_preferences(const HashMap<String, String>& user_preferences, const String key, const String argument, const String default_program);
+ bool open_with_user_preferences(const HashMap<String, String>& user_preferences, const String key, const String argument, const String default_program = {});
  bool open_with_handler_name(const URL&, const String& handler_name);
 };
 }