use an env var for configurable proxy header (#8863)

src/view/com/modals/DeleteAccount.tsx

@@ -10,6 +10,7 @@ import {LinearGradient} from 'expo-linear-gradient'
 import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 
+import {DM_SERVICE_HEADERS} from '#/lib/constants'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {useWebMediaQueries} from '#/lib/hooks/useWebMediaQueries'
 import {cleanError} from '#/lib/strings/errors'
@@ -17,7 +18,6 @@ import {colors, gradients, s} from '#/lib/styles'
 import {useTheme} from '#/lib/ThemeContext'
 import {isAndroid, isWeb} from '#/platform/detection'
 import {useModalControls} from '#/state/modals'
-import {DM_SERVICE_HEADERS} from '#/state/queries/messages/const'
 import {useAgent, useSession, useSessionApi} from '#/state/session'
 import {atoms as a, useTheme as useNewTheme} from '#/alf'
 import {CircleInfo_Stroke2_Corner0_Rounded as CircleInfo} from '#/components/icons/CircleInfo'