Apply padding to more AGIPD constants when loading

We missed some bad pixel operations, as well as SlopesFF having 202 cells.

As before, the exceptions where thrown in preReconfigure when the manager tries to propagate the number of memory cells on its children. It has nothing to do with actual query of constants.

@ahmedk @kluyvert

src/calng/corrections/AgipdCorrection.py

@@ -470,9 +470,6 @@ class AgipdBaseRunner(base_kernel_runner.BaseKernelRunner):
             else:
                 self.md_additional_offset.fill(0)
         elif constant is Constants.SlopesFF:
-            # Always has 352 cells, so allocating the right size in
-            # rel_gain_map fixes the shape problems here.
-
             # constant shape: y, x, memory cell
             if constant_data.shape[2] == 2:
                 # TODO: remove support for old format
@@ -486,9 +483,9 @@ class AgipdBaseRunner(base_kernel_runner.BaseKernelRunner):
                         self._constant_memory_cells,
                     ),
                 )
-            self.xray_gain_map[:] = self._xp.asarray(
+            self.xray_gain_map[:] = self._pad_constant(self._xp.asarray(
                 constant_data.transpose(), dtype=np.float32
-            )[:self._constant_memory_cells]
+            ), value=1.0)[:self._constant_memory_cells]
         else:
             assert constant in bad_pixel_constants
             if (
@@ -507,7 +504,7 @@ class AgipdBaseRunner(base_kernel_runner.BaseKernelRunner):
                 ):
                     # BadPixelsFF is not per gain stage - broadcasting along gain
                     constant_data = self._xp.broadcast_to(
-                        constant_data.transpose()[
+                        self._pad_constant(constant_data.transpose())[
                             :self._constant_memory_cells, ..., np.newaxis
                         ],
                         self._gm_map_shape,
@@ -518,7 +515,7 @@ class AgipdBaseRunner(base_kernel_runner.BaseKernelRunner):
                 ):
                     # old BadPixelsPC have different axis order
                     constant_data = self._xp.broadcast_to(
-                        constant_data.transpose((0, 2, 1))[
+                        self._pad_constant(constant_data.transpose((0, 2, 1)))[
                             :self._constant_memory_cells, ..., np.newaxis
                         ],
                         self._gm_map_shape,