Fix PMD collapsible if statement.

Author: Maryamh12

src/main/java/com/thealgorithms/backtracking/WordSearch.java

@@ -83,10 +83,8 @@ public boolean exist(char[][] board, String word) {
         for (int i = 0; i < m; i++) {
             for (int j = 0; j < n; j++) {
 
-                if (board[i][j] == word.charAt(0)) {
-                    if (dfs(board, i, j, word, 0)) {
+                if (board[i][j] == word.charAt(0) && dfs(board, i, j, word, 0)) {
                         return true;
-                    }
                 }
             }
         }