🐞 Using meal plan servings + or - button on a blank field initially increments by 0.01

### What happened?

If the + (or -) servings button is used while field is empty or 0, it initially increments by 0.01 then whole numbers (0.01, 1.01, 2.01, 3.01 etc)

### App Version

2.1.0

### Server Version

2.6.9

### Platform(s)

Android

### Additional context

I'm assuming this is related to changes for #394 