fix: remove useless FIXME comments

src/commands/global_config.cr

@@ -2,7 +2,7 @@ require "./abstract_command"
 
 module GX::Commands
   class GlobalConfig < AbstractCommand
-    def initialize(config : GX::Config) # FIXME
+    def initialize(config : GX::Config)
     end
 
     def execute

src/commands/global_help.cr

@@ -2,7 +2,7 @@ require "./abstract_command"
 
 module GX::Commands
   class GlobalHelp < AbstractCommand
-    def initialize(@config : GX::Config) # FIXME
+    def initialize(@config : GX::Config)
     end
 
     def execute

src/commands/mapping_mount.cr

@@ -5,7 +5,7 @@ module GX::Commands
   class MappingMount < AbstractCommand
     @file_system_manager : FileSystemManager
 
-    def initialize(@config : GX::Config) # FIXME
+    def initialize(@config : GX::Config)
       @config.load_from_env
       @config.load_from_file
       @file_system_manager = FileSystemManager.new(@config)

src/commands/mapping_umount.cr

@@ -5,7 +5,7 @@ module GX::Commands
   class MappingUmount < AbstractCommand
     @file_system_manager : FileSystemManager
 
-    def initialize(@config : GX::Config) # FIXME
+    def initialize(@config : GX::Config)
       @config.load_from_env
       @config.load_from_file
       @file_system_manager = FileSystemManager.new(@config)