basic/escape: swap 'bad' and 'len' params for decescape()

To follow our usual coding style.

src/basic/escape.c

@@ -478,7 +478,7 @@ char* octescape(const char *s, size_t len) {
         return buf;
 }
 
-char* decescape(const char *s, const char *bad, size_t len) {
+char* decescape(const char *s, size_t len, const char *bad) {
         char *buf, *t;
 
         /* Escapes all chars in bad, in addition to \ and " chars, in \nnn decimal style escaping. */

src/basic/escape.h

@@ -67,7 +67,7 @@ static inline char* xescape(const char *s, const char *bad) {
         return xescape_full(s, bad, SIZE_MAX, 0);
 }
 char* octescape(const char *s, size_t len);
-char* decescape(const char *s, const char *bad, size_t len);
+char* decescape(const char *s, size_t len, const char *bad);
 char* escape_non_printable_full(const char *str, size_t console_width, XEscapeFlags flags);
 
 char* shell_escape(const char *s, const char *bad);