Leave default log level at 5 during test runs

Otherwise if debug output logging is enabled in the prefs nothing is
logged. Test output is still controlled by '-d n'.

test/runtests.sh

@@ -14,7 +14,6 @@ function makePath {
 	eval $__assignTo="'$__path'"
 }
 
-DEBUG=false
 if [ -z "$FX_EXECUTABLE" ]; then
 	if [ "`uname`" == "Darwin" ]; then
 		FX_EXECUTABLE="/Applications/Firefox.app/Contents/MacOS/firefox"
@@ -42,7 +41,8 @@ DONE
 	exit 1
 }
 
-DEBUG_LEVEL=0
+DEBUG=false
+DEBUG_LEVEL=5
 while getopts "bcd:fg:htx:" opt; do
 	case $opt in
         b)