E712: Invalid parentheses removal

E712 fix may remove parentheses in a way which causes invalid syntax:

```py
def a(x):
  return x == 5

if(a(2)) == True:
  print("it's five")
```

Becomes:

```py
def a(x):
  return x == 5

ifa(2) is True:
  print("it's five")
```

Discovered by #4822.