fix#1665
- cloned vnodes with extra props will receive only the full props flag
- this commit affects `cloneVNode` behavior when used in manual render
functions.
- ok for normal elements since elements only use patchFlags for own
props optimization
- full props flag is skipped for fragments because fragments use
patchFlags only for children optimization
- this also affects `shouldUpdateComponent` where it should now only
respect patchFlags in optimized mode, since component vnodes use
the patchFlag for both props and slots optimization checks.
6390ddfb7d