Revert "When the user adjusts the left side bearing, move the bearing with the mouse and scroll in order to keep the glyph contours in the same place."

This reverts commit 7ccd15b6e1c93ca99161c0f28e263374edf96f60.

Dave and Adrien complained that the movement was too rough.

Conflicts:

	fontforgeexe/cvpointer.c
Merge pull request #1948 from fontforge/revert_sidebearing_adjustment_change_1

Revert the left side bearing adjustment change.