Fix the timestamp by changing %p to %T

[saladpanda]

I assume the %p is taken from http://www.nparikh.org/unix/prompt.php which says it shows The precise time of day in 12-hour AM/PM format, with seconds..

%p does not work for me and I could not find any documentation on it. man zshmisc mentions

       %T     Current time of day, in 24-hour format.

       %t
       %@     Current time of day, in 12-hour, am/pm format.

       %*     Current time of day in 24-hour format, with seconds.

But %t and %@ don't work for me either and I think showing the seconds is unnecessary clutter. Hence I changed it to %T.

Screenshots

before:

after

[avalonwilliams]

This is fixed by #8