QT issue #2862. Fixes feel when resizing the last column on tables.

added last fix for glitch when window was resized and tab switches were performed.
code simplified, no need for `geometriInitialized` state to be kept anymore.
Merge branch 'QT-issue-2862-fix-tables-last-column-resize-feel' of github.com:gubatron/bitcoin into QT-issue-2862-fix-tables-last-column-resize-feel