Revert "Allow switching out LogFilter globally"

This reverts commit ede725d.

Author: Bungeefan

lib/src/logger.dart

@@ -50,9 +50,6 @@ class Logger {
   /// All logs with levels below this level will be omitted.
   static Level level = Level.verbose;
 
-  /// The current default implementation of log filter.
-  static LogFilter defaultLogFilter = DevelopmentFilter();
-
   static final Set<LogCallback> _logCallbacks = {};
 
   static final Set<OutputCallback> _outputCallbacks = {};
@@ -72,7 +69,7 @@ class Logger {
     LogPrinter? printer,
     LogOutput? output,
     Level? level,
-  })  : _filter = filter ?? defaultLogFilter,
+  })  : _filter = filter ?? DevelopmentFilter(),
         _printer = printer ?? PrettyPrinter(),
         _output = output ?? ConsoleOutput() {
     _filter.init();