Revert "Changed delimeter to accept multiple characters."

Bug was found where certain modules caused dwm to lag horribly.
Reverting until a fix can be found.
This reverts commit 3da92ebccb863394a3501ce2d9cbe60ad9aafc8c.

blocks.h

@@ -16,5 +16,5 @@ static const Block blocks[] = {
 	{"", "~/bin/statusbar/clock",						5,		0},
 };
 
-//sets delimeter between status commands. Empty string ("") means no delimeter.
-static char* delim = "|";
+//sets delimeter between status commands. NULL character ('\0') means no delimeter.
+static char delim = '|';