fix compile error

Author: lrvideckis

tests/library_checker_aizu_tests/strings/kmp.test.cpp

@@ -1,7 +1,7 @@
 #define PROBLEM \
   "https://onlinejudge.u-aizu.ac.jp/courses/lesson/1/ALDS1/all/ALDS1_14_B"
 #include "../template.hpp"
-#include "../../../library/strings/knuth_morris_pratt.hpp"
+#include "../../../library/strings/kmp.hpp"
 int main() {
   cin.tie(0)->sync_with_stdio(0);
   string haystack, needle;