Recognize serial monitors with full path in MONITOR_CMD

When assembling the command line for the various supported serial
monitors, MONITOR_CMD must match the name of one of the supported
commands to be recognized.  Serial monitors given with leading path
components are not recognized, and a command like

  make MONITOR_CMD=~/src/picocom/picocom monitor

errors out as the fallback monitor command is executed instead of the
picocom-specific one.  However, sometimes it's necessary to specify a
supported serial monitor with its full path, because e.g. the user
wants to tests a freshly compiled version before installing it.  Sure,
the user could just run the serial monitor directly, but that's
cumbersome because he has to pay attention to use the right baud rate
and USB port.

So strip all leading path components, if present, from MONITOR_CMD
using the 'nondir' make function before checking whether it's one of
the supported serial monitors.  This way commands like the above would
just work.

While at it, remove the single quotes around 'putty': they are both
unnecessary and inconsistent with similar constructs throughout
Arduino.mk.

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