remove unused logic

Author: scivision

+stdlib/root_name.m

@@ -13,7 +13,7 @@
 r = repmat("", size(p));
 
 if ispc()
-  i = startsWith(p, textBoundary + lettersPattern(1) + ":");
+  i = startsWith(p, lettersPattern(1) + ":");
   r(i) = extractBefore(p(i), 3);
 end