Remove dashed bottom-border from last child of .wb-statementview

in non-js, the dashed border on the bottom of the last
.wb-statementview statement (child) looks slightly odd.

it is better to remove it from the last child of
.wb-statementview and put the border on the top of
the wikibase-toolbar-wrapper which is present when
javascript is enabled.

Bug: 73172
Change-Id: I0b97c5b1a7f60822e97e921f89d4b4076d164e52
Merge "Remove dashed bottom-border from last child of .wb-statementview"