MenuLayout: Remove some redundant code
MenuLayout: Remove some redundant code

Calling this.updateSizes() at the end handles this.

Follow-up to I1c42fa4fa79efe023b3652717b3cb8545caeb01a.

Change-Id: I029ec6890a203dac0a2e75d26d478e67b93e252e

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui