fix: typescript example application

[blumamir]

fixing 2 minor issues I spotted in typescript Example Application:

1. npm install lists the express dependency twice, which is redundant. Removed one of these.
2. when calling app.listen() on the express app, the arrow function that prints a message to log should actually be a second parameter to the listen function. The parentheses are currently closed too early (after the PORT parameter), causing no message to be output to the console as intended.
3. parseInt function on the PORT is invoked in different patterns in js and ts examples (when extracting env variable in ts, and when invoking app.listen in js). I aligned them so the call is done in the same place for both examples

[svrnm]

lgtm