Library check and uncheck all of duplicated option names

Multiselect shouldn't behave like this. It should return separate results for each option.

Re produce bug:

func TestInteractiveMultiselectPrinter_Show_Duplicated(t *testing.T) {
	go func() {
		keyboard.SimulateKeyPress(keys.Enter)
		keyboard.SimulateKeyPress(keys.Down)
		keyboard.SimulateKeyPress(keys.Down)
		keyboard.SimulateKeyPress(keys.Enter)
		keyboard.SimulateKeyPress(keys.Down)
		keyboard.SimulateKeyPress(keys.Down)
		keyboard.SimulateKeyPress(keys.Enter)
		keyboard.SimulateKeyPress(keys.Tab)
	}()
	r, _ := pterm.DefaultInteractiveMultiselect.
		WithOptions([]string{"a", "a", "a", "a", "a", "a", "a", "a", "a"}).
		Show()
	testza.AssertEqual(t, []string{"a", "a", "a"}, r)
}

result:

=== RUN   TestInteractiveMultiselectPrinter_Show_Duplicated
Please select your options: 
  > a

    interactive_multiselect_printer_test.go:109: 
        
           1| Two objects that should be equal, are not equal.
           2| 
           3| Expected:
           4| ([]string) (len=3 cap=3) {
           5|  (string) (len=1) "a",
           6|  (string) (len=1) "a",
           7|  (string) (len=1) "a"
           8| }
           9| 
          10| Actual:
          11| ([]string) (len=1 cap=1) {
          12|  (string) (len=1) "a"
          13| }
          14| 
          15| Difference:
          16| (1. -) ([]string) (len=3 cap=3) {
          17| (2. -)  (string) (len=1) "a",
          18| (3. -)  (string) (len=1) "a",
          19| (1. +) ([]string) (len=1 cap=1) {
          20| (2. #)  (string) (len=1) "a"
          21| (3. #) }
        
        
--- FAIL: TestInteractiveMultiselectPrinter_Show_Duplicated (0.00s)

Start with TestInteractiveMultiselectPrinter_Show_Duplicated in interactive_multiselect_printer_test.go and follow the DefaultInteractiveMultiselect.WithOptions(...).Show() entry point. Reproduce the duplicate-option selection, then confirm the test returns three separate "a" results rather than one and passes.