pinned tab icon is not showing

[trusktr]

See screenshots:

(shows setting enabled)

(shows the tab has an "unpin" option because it is pinned, but there's no icon)

system info:

debug info with package info

{
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  "platform": "darwin",
  "release": "18.2.0",
  "vmpVersion": "1.35.0",
  "vmpConfig": {},
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    "aligner-javascript: 1.3.0",
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    "autocomplete-modules: 2.2.2",
    "autocomplete-paths: 2.12.2",
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    "busy-signal: 1.4.3",
    "cursor-history: 0.13.1",
    "docblockr: 0.13.7",
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    "linter-eslint: 8.4.1",
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    "minimap-linter: 2.2.1",
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    "ex-mode: 0.18.0",
    "git-blame: 1.7.0",
    "zentabs: 0.8.9"
  ]
}