Remove zero-padding from nowday and whenday (fixes #9397)

This fixes cases where the day component of the when parameter resolved
to a non-zero padded integer under 10, such as "when = 1st at 01"

The comparison against the nowday variable failed consistently since
the date command format used always returned a zero-padded two digit
integer.

The solution chosen is to avoid generating nowday with zero-padding and
remove any zero-padding from whenday parameter using a more thorough
sed pattern which now also removes any non-alphanumeric characters from
the string.

src/backupninja.in

@@ -186,7 +186,7 @@ function tolower() {
 
 # simple to integer function
 function toint() {
-   echo "$1" | tr -d '[:alpha:]'
+   echo "$1" | @SED@ 's/[^0-9]//g;s/^0\+//'
 }
 
 #
@@ -202,7 +202,7 @@ function toint() {
 # we grab the current time once, since processing
 # all the configs might take more than an hour.
 nowtime=`LC_ALL=C date +%H`
-nowday=`LC_ALL=C date +%d`
+nowday=`LC_ALL=C date +%-d`
 nowdayofweek=`LC_ALL=C date +%A`
 nowdayofweek=`tolower "$nowdayofweek"`