Fix generation of environment variable list

[kb2ma]

The command below in src/start.sh appends an "=" to each environment variable name in the generated list:

$ env | grep -v -w '_' | awk -F: '{ st = index($0,"=");print substr($1,0,st) ","}' | tr -d "\n"
SHELL=,SESSION_MANAGER=,QT_ACCESSIBILITY=,COLORTERM=, ...

Changing the argument to awk -F removes the "=", as required by su -w

$ env | grep -v -w '_' | awk -F= '{ st = index($0,"=");print substr($1,0,st) ","}' | tr -d "\n"
SHELL,SESSION_MANAGER,QT_ACCESSIBILITY,COLORTERM, ...

Partial fix for #90

[ghost]

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[phil-d-wilson]

I've not tested this, but happy to accept as-is. :)

Thanks Ken!