Non-maximized state is not kept across sessions

[Tyriar]

• VSCode Version: Code - Insiders 1.18.0-insider (8dfa696, 2017-10-31T16:36:35.429Z)
• OS Version: Linux x64 4.10.0-26-generic
• Extensions:

Extension	Author (truncated)	Version
EditorConfig	Edi	0.11.1
lorem-ipsum	Tyr	1.0.0
shell-launcher	Tyr	0.1.4
vscode-terminal-here	Tyr	0.0.5
vscode-svgviewer	css	1.4.3
tslint	eg2	1.0.14
git-project-manager	fel	1.4.0
md-navigate	jri	0.0.1
vscode-rust	kal	0.4.2
vscode-scss	mrm	0.6.2
cpptools	ms-	0.14.0
seti-icons	qin	0.1.3

(3 theme extensions excluded)

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#36906

Repro:

1. Open terminal
2. Resize it to take around 50%
3. Maximize panel
4. Quit VS Code
5. Launch VS Code
6. Press restore panel size button, the panel will be in it's smallest possible size, not the ~50% expected