[FLASK] Fix some issues with installing snaps that request eth_accounts

[FrederikBolding]

Explanation

Fixes some issues with installing snaps that request the eth_accounts permission AND other permissions. Reported by a user in Discord.

Manual Testing Steps

1. Create a snap with the following permissions

  "initialPermissions": {
    "eth_accounts": {
      "requiredMethods": []
    },
    "snap_confirm": {},
    "snap_manageState": {},
    "endowment:network-access": {},
    "snap_getBip44Entropy": [
      {
        "coinType": 60
      }
    ]
  },

2. Verify that the snap can install successfully

[metamaskbot]

Builds ready [2cfb234]

• builds: chrome, firefox, opera
• builds (beta): chrome, firefox, opera
• builds (flask): chrome, firefox, opera
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (2228 ± 127 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	90	2616	235	546	262
		domContentLoaded	1708	2616	2203	257	124
		load	1708	2676	2228	264	127
		domInteractive	1708	2616	2203	257	124