Fix indices/1 and rindex/1 in case of overlapping matches in strings

Fixes #2433

src/jv.c

@@ -1296,7 +1296,7 @@ jv jv_string_indexes(jv j, jv k) {
     p = jstr;
     while ((p = _jq_memmem(p, (jstr + jlen) - p, idxstr, idxlen)) != NULL) {
       a = jv_array_append(a, jv_number(p - jstr));
-      p += idxlen;
+      p++;
     }
   }
   jv_free(j);

tests/jq.test

@@ -1265,6 +1265,10 @@ split("")
 "a,bc,def,ghij,klmno"
 [1,13,[1,4,8,13]]
 
+[ index("aba"), rindex("aba"), indices("aba") ]
+"xababababax"
+[1,7,[1,3,5,7]]
+
 indices(1)
 [0,1,1,2,3,4,1,5]
 [1,2,6]