AAM timeout does not work correctly

**Summary**
AAM timeout seems to hang on moderate size smiles even with a small timeout.

**Steps to Reproduce**
1. Indigo via Java (and likely C code), 1.14.0 - 1.20.0

```java
String smi = "N[C@@H](CCC(=O)NCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCC(NCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCNC(=O)CCCCCCCCCCCCCCC)=O)C(=O)NCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCC(NCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCNC(=O)CCCCCCCCCCC/C=C\\CCCCCCCC)=O.O=C1CCC(=O)N1OC(=O)CCOCCOCCOCCOCCNC(=O)CCN1C(=O)C=CC1=O.C(N(CC)CC)C>C(Cl)Cl>N[C@@H](CCC(=O)NCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCC(NCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCNC(=O)CCCCCCCCCCCCCCC)=O)C(=O)NCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCC(NCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCCOCCNC(=O)CCCCCCCCCCC/C=C\\CCCCCCCC)=O";
Indigo indigo = new Indigo();
indigo.setOption("aam-timeout", 5); // 5 ms
IndigoObject reaction = indigo.loadReaction(smi);
long t0 = System.nanoTime();
ReactionMapper.mapReaction(reaction);
long t1 = System.nanoTime();
System.err.println(TimeUnit.NANOSECONDS.toMillis(t1-t0));
System.err.println(reaction.smiles());
```

**Expected behavior**
The atom map should fail fast

**Actual behavior**
The automap hangs. In general most polyethylene glycols seem problematic

**Environment details:**
- 1.20.0 (also confirmed in 1.14.0)

**Attachments**
If applicable, add attachment files to reproduce the issue.

**Additional context**
Add any other context about the problem here.