Remove trailing delimiters from csv_from_result

When using the csv_from_result function, the returned string includes an
extra delimiter at the end of every line, usually a comma unless another
delimiter is specified.  A simple addition of a couple of lines to
remove the extra delimiter from the column names and the data rows is
included. (Lines 241 and 251)
diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index 9822fda..9803307 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -238,7 +238,8 @@
 			$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $name).$enclosure.$delim;
 		}
 
-		$out = rtrim($out).$newline;
+		$out = substr(rtrim($out),0,-strlen($delim)); // Remove the trailing delimiter character(s) at the end of the column names
+		$out = $out.$newline;
 
 		// Next blast through the result array and build out the rows
 		while ($row = $query->unbuffered_row('array'))
@@ -247,6 +248,7 @@
 			{
 				$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $item).$enclosure.$delim;
 			}
+			$out = substr(rtrim($out),0,-strlen($delim)); // Remove the trailing delimiter character(s) at the end of the row lines
 			$out = rtrim($out).$newline;
 		}