Remove margins from buttons

These were for my ios testing, which I might
add back in later.

EditPlan.tsx

@@ -121,7 +121,5 @@ const styles = StyleSheet.create({
     fontSize: 20,
     marginBottom: MARGIN,
   },
-  button: {
-    margin: MARGIN * 2,
-  },
+  button: {},
 })

EditSet.tsx

@@ -198,7 +198,6 @@ export default function EditSet() {
       </View>
 
       <Button
-        style={{margin: MARGIN * 2}}
         disabled={!name}
         mode="contained"
         icon="save"

EditWorkout.tsx

@@ -186,12 +186,7 @@ export default function EditWorkout() {
             </Button>
           )}
         </ScrollView>
-        <Button
-          style={{margin: MARGIN * 2}}
-          disabled={!name}
-          mode="contained"
-          icon="save"
-          onPress={save}>
+        <Button disabled={!name} mode="contained" icon="save" onPress={save}>
           Save
         </Button>
         <ConfirmDialog

StartPlan.tsx

@@ -165,11 +165,7 @@ export default function StartPlan() {
             />
           )}
         </View>
-        <Button
-          style={{margin: MARGIN * 2}}
-          mode="contained"
-          icon="save"
-          onPress={handleSubmit}>
+        <Button mode="contained" icon="save" onPress={handleSubmit}>
           Save
         </Button>
       </View>