Time-Series table crush header issue

[kalimuthu123]

A clear and concise description of what the bug is.

Time-Series table crush #6788

what you expected to happen.

header and tooltip are aligned normal

what actually happens.

header and tooltip are aligned missed

Screenshots

If applicable, add screenshots to help explain your problem.

Environment

(please complete the following information):

• superset version: superset 0.35.2
• python version: python --3.6
• node.js version: node -v10.15.1
• npm version: npm -6.9.0

table.js is showing the warnings of table theader tfoot

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