Removed get_focus_matrix because it is already implemented in geo.Point

Author: ltetrel

src/openlifu/bf/__init__.py

@@ -3,7 +3,6 @@
 from .delay_methods import DelayMethod
 from .focal_patterns import FocalPattern, SinglePoint, Wheel
 from .get_beamwidth import get_beamwidth
-from .get_focus_matrix import get_focus_matrix
 from .mask_focus import mask_focus
 from .offset_grid import offset_grid
 from .pulse import Pulse
@@ -17,7 +16,6 @@
     "SinglePoint",
     "Pulse",
     "Sequence",
-    "get_focus_matrix",
     "offset_grid",
     "calc_dist_from_focus",
     "mask_focus",