Update BlackTools.tcl

Lets add m (minutes) to match the legend on https://github.com/tclscripts/BlackTools-TCL/blob/master/BlackTools.tcl#L116 :D

BlackTools.tcl

@@ -115,7 +115,7 @@ set black(update_note) "1"
 ###
 #Time interval check (<x>m (minutes), <x>h (hours), <x>d (days))
 
-set black(update_time_check) "60"
+set black(update_time_check) "60m"
 
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