Fix textinputs example

This should fix the textinputs example, as the code is using KeyMsg. KeyMsg seems to have an issue with the v2
alpha where it appears that both KeyPressMsg and KeyReleaseMsg may be unintentionally being called sequentionally.
Just using one or the other should solve the issue for this. This issue also likely exists within other examples and may
Need to be looked at separately.

No PR/Issue Tag atm

examples/textinputs/main.go

@@ -70,7 +70,7 @@ func (m model) Init() (tea.Model, tea.Cmd) {
 
 func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	switch msg := msg.(type) {
-	case tea.KeyMsg:
+	case tea.KeyPressMsg:
 		switch msg.String() {
 		case "ctrl+c", "esc":
 			return m, tea.Quit