Don't use parenthesis around pgets

lib/rex/ui/text/input/readline.rb

@@ -88,7 +88,7 @@ begin
     # down other background threads. This is important when there are many active
     # background jobs, such as when the user is running Karmetasploit
     #
-    def pgets()
+    def pgets
 
       line = nil
       orig = Thread.current.priority

lib/rex/ui/text/shell.rb

@@ -22,7 +22,7 @@ module Shell
   module InputShell
     attr_accessor :prompt, :output
 
-    def pgets()
+    def pgets
 
       output.print(prompt)
       output.flush
@@ -370,7 +370,7 @@ protected
       end
 
       output.input = input
-      line << input.pgets()
+      line << input.pgets
       output.input = nil
       log_output(input.prompt)
     end