keyin - remove strncpy (so its strcpy) because its useless

wel alloc the buffer to be precisely the right size anyway so strncpy
is just more complex code that leads to warnings.

src/bin/keyin.c

@@ -223,7 +223,7 @@ key_binding_lookup(const char *keyname,
    kb->hyper = hyper;
    kb->len = len;
    kb->keyname = alloca(sizeof(char) * len + 1);
-   strncpy((char *)kb->keyname, keyname, kb->len + 1);
+   strcpy((char *)kb->keyname, keyname);
 
    return eina_hash_find(_key_bindings, kb);
 }