src/Dialogs.js: remove '.js' from require path
src/Dialogs.js: remove '.js' from require path

see 46d3a1ca218a54b91c6e8e44c7ca2d22873b01eb

josephfrazier/SIP.js,onsip/SIP.js,markandrus/SIP.js,ronlobo/SIP.js,joseph-onsip/SIP.js,Escaux/SIP.js,onsip/SIP.js