remove sandbox labels (#2883)

* rm sandbox

* remove comment

src/view/com/util/PostSandboxWarning.tsx

@@ -1,35 +0,0 @@
-import React from 'react'
-import {StyleSheet, View} from 'react-native'
-import {Text} from './text/Text'
-import {usePalette} from 'lib/hooks/usePalette'
-import {useSession} from '#/state/session'
-
-export function PostSandboxWarning() {
-  const {isSandbox} = useSession()
-  const pal = usePalette('default')
-  if (isSandbox) {
-    return (
-      <View style={styles.container}>
-        <Text
-          type="title-2xl"
-          style={[pal.text, styles.text]}
-          accessible={false}>
-          SANDBOX
-        </Text>
-      </View>
-    )
-  }
-  return null
-}
-
-const styles = StyleSheet.create({
-  container: {
-    position: 'absolute',
-    top: 6,
-    right: 10,
-  },
-  text: {
-    fontWeight: 'bold',
-    opacity: 0.07,
-  },
-})