fix stupid mistake in inline if statement

Author: m0gg

lib/dart2js.rb

@@ -42,7 +42,7 @@ def initialize(file_or_data, options = {})
 
   def compile minify=true
     cmd = [ @dart2js_binary,
-            minify ? ' -m ' || '',
+            minify ? ' -m ' : '',
             %Q{-o"#{out_file}"},
             in_file = prepare_input.path ].join(' ')
     process = IO.popen(cmd, 'r')
@@ -67,4 +67,4 @@ def prepare_input
       @input_file
     end
   end
-end
+end