samples: remove indirect Pillow requirement from isoFdModelling

Keep the sample requirements limited to direct dependencies. Matplotlib
already installs Pillow for its optional wavefield display.

Signed-off-by: Keith Kraus <keith.j.kraus@gmail.com>

Author: kkraus14

samples/cuda_bindings/extra/isoFdModelling/README.md

@@ -73,7 +73,6 @@ non-interactive run.
 - `cuda-python` (>=13.4.0)
 - `numpy`
 - `matplotlib` (optional)
-- `pillow` (>=13.0.0, installed with Matplotlib)
 
 ## Installation
 

samples/cuda_bindings/extra/isoFdModelling/requirements.txt

@@ -6,5 +6,3 @@ numpy>=1.24
 # Required for the default wavefield display; pass --no-display for CI or
 # other non-interactive runs.
 matplotlib
-# Matplotlib's image dependency.
-pillow>=13.0.0