Fix default value for setting "Auto-hide item methods' documentation"

[dima74]

If I open any documentation page in incognito mode (for example for Option enum), then methods will be collapsed, though on the settings page there will be displayed that "Auto-hide item methods' documentation" option is disabled.

If I understand correctly, property "Auto-hide item methods' documentation" should be disabled by default, so correct check would be property === "true". This is consistent with other options:

Options which are enabled by default are compared to "false"

rust/src/librustdoc/html/render.rs

Lines 1965 to 1968 in 938d4ff

	("item-declarations", "Auto-hide item declarations.", true),
	("item-attributes", "Auto-hide item attributes.", true),
	("trait-implementations", "Auto-hide trait implementations documentation",
	true),

rust/src/librustdoc/html/static/main.js

Line 2238 in 938d4ff

var showItemDeclarations = getCurrentValue("rustdoc-item-declarations") === "false";

rust/src/librustdoc/html/static/main.js

Line 2321 in 938d4ff

if (getCurrentValue("rustdoc-item-attributes") !== "false") {

rust/src/librustdoc/html/static/main.js

Line 2070 in 938d4ff

} else if (getCurrentValue("rustdoc-trait-implementations") !== "false") {

Options which are disabled by default are compared to "true"

rust/src/librustdoc/html/render.rs

Lines 1970 to 1972 in 938d4ff

	("go-to-only-result", "Directly go to item in search if there is only one result",
	false),
	("line-numbers", "Show line numbers on code examples", false),

rust/src/librustdoc/html/static/main.js

Line 1389 in 938d4ff

getCurrentValue("rustdoc-go-to-only-result") === "true") {

rust/src/librustdoc/html/static/main.js

Line 2334 in 938d4ff

if (getCurrentValue("rustdoc-line-numbers") === "true") {

[rust-highfive]

Some changes occurred in HTML/CSS.

cc @GuillaumeGomez

[rust-highfive]

r? @QuietMisdreavus

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[GuillaumeGomez]

Thanks!

@bors: r+ rollup

[bors]

📌 Commit b6cfcd3 has been approved by GuillaumeGomez

[bors]

⌛ Testing commit b6cfcd3 with merge 3418d2f...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: GuillaumeGomez
Pushing 3418d2f to master...