Deduplicate seek forward and backward action. #1844
Merged
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Detailed description
Use the same QAction for seek in menu bar and toolbar. Allows action shortcut to be displayed in any of applicable places. Will also help with state synchronization in future if we decide to implement disabling of buttons when further seeking is not possible.
Don't want to steal too many "good first issue" from those who need them, but I didn't want to explain Qt recommended approach one more time.
Test plan (required)
Closing issues
Closes #1836