Change Numeric Keyboard to Keypad
Change Numeric Keyboard to Keypad

Added pattern to html to make the keyboard a keypad

Closes #4426

    Added pattern="[0-9]*" to the postsPerPage input on general.hbs

kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin,JohnONolan/Ghost-Admin,acburdine/Ghost-Admin,dbalders/Ghost-Admin,kevinansfield/Ghost-Admin,airycanon/Ghost-Admin,airycanon/Ghost-Admin,TryGhost/Ghost-Admin,acburdine/Ghost-Admin,JohnONolan/Ghost-Admin,dbalders/Ghost-Admin