Update AccessMap.java

in cases where the AT (badly written ones atleast) contain lines like this
```
public ber.c#ThreadDownloadImageData field_110315_c
public ber.e#ResourceLocation field_110313_e
```

the old code would grab the last space character, and this only grab 'public' as the line.

Ofcourse using trim would also eat leading white space, but I don't think thats an issue. Not to mention, the old implementation would only trim 1 space off the end of the line, and not any others if they exist.