Update DSMC picmi class initialization function (#4646)

Author: roelof-groenewald

Python/pywarpx/picmi.py

@@ -1575,7 +1575,7 @@ def __init__(self, name, species, scattering_processes, ndt=None, **kw):
 
         self.handle_init(kw)
 
-    def initialize_inputs(self):
+    def collision_initialize_inputs(self):
         collision = pywarpx.Collisions.newcollision(self.name)
         collision.type = 'dsmc'
         collision.species = [species.name for species in self.species]

Regression/WarpX-tests.ini

@@ -3079,24 +3079,24 @@ doVis = 0
 compareParticles = 0
 analysisRoutine = Examples/Tests/electrostatic_dirichlet_bc/analysis.py
 
-# [Python_dsmc_1d]
-# buildDir = .
-# inputFile = Examples/Physics_applications/capacitive_discharge/PICMI_inputs_1d.py
-# runtime_params =
-# customRunCmd = python3 PICMI_inputs_1d.py --test --dsmc
-# dim = 1
-# addToCompileString = USE_PYTHON_MAIN=TRUE USE_OPENPMD=TRUE QED=FALSE
-# cmakeSetupOpts = -DWarpX_DIMS=1 -DWarpX_APP=OFF -DWarpX_PYTHON=ON -DWarpX_OPENPMD=ON -DWarpX_QED=OFF
-# target = pip_install
-# restartTest = 0
-# useMPI = 1
-# numprocs = 2
-# useOMP = 1
-# numthreads = 1
-# compileTest = 0
-# doVis = 0
-# compareParticles = 0
-# analysisRoutine = Examples/Physics_applications/capacitive_discharge/analysis_dsmc.py
+[Python_dsmc_1d]
+buildDir = .
+inputFile = Examples/Physics_applications/capacitive_discharge/PICMI_inputs_1d.py
+runtime_params =
+customRunCmd = python3 PICMI_inputs_1d.py --test --dsmc
+dim = 1
+addToCompileString = USE_PYTHON_MAIN=TRUE USE_OPENPMD=TRUE QED=FALSE
+cmakeSetupOpts = -DWarpX_DIMS=1 -DWarpX_APP=OFF -DWarpX_PYTHON=ON -DWarpX_OPENPMD=ON -DWarpX_QED=OFF
+target = pip_install
+restartTest = 0
+useMPI = 1
+numprocs = 2
+useOMP = 1
+numthreads = 1
+compileTest = 0
+doVis = 0
+compareParticles = 0
+analysisRoutine = Examples/Physics_applications/capacitive_discharge/analysis_dsmc.py
 
 [Python_ElectrostaticSphereEB]
 buildDir = .