fix(iidxhook-util/settings): Bugfix broken paths with mixed / and \

Applies to iidx18 and iidx19 when using the recently extended
redirect feature for settings paths, mixing / and \ crashes the
game in some operator sub-menus when trying to save settings.

src/main/util/str.c

@@ -194,6 +194,17 @@ wchar_t *str_widen(const char *src)
     return result;
 }
 
+void str_replace(char *str, char cur, char new)
+{
+    while (*str != '\0') {
+        if (*str == cur) {
+            *str = new;
+        }
+
+        str++;
+    }
+}
+
 wchar_t *wstr_dup(const wchar_t *wstr)
 {
     wchar_t *dest;