Bug 1052272 - TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/keyboard/test/marionette/uninstallation_test.js | Show Keyboard App after uninstallation "before each" hook

This should have been in the original bug 1044744 patch. Before this current bug, other removeKeyboard() calls in other tests would not clear showingLayoutInfo, and thus this test would pass, coincidentally.