fix tests/mpi/step-39
fix tests/mpi/step-39

And yes, making a copy of the matrix was indeed a mistake here.

shakirbsm/dealii,gpitton/dealii,nicolacavallini/dealii,angelrca/dealii,andreamola/dealii,sriharisundar/dealii,kalj/dealii,YongYang86/dealii,mtezzele/dealii,johntfoster/dealii,adamkosik/dealii,natashasharma/dealii,adamkosik/dealii,andreamola/dealii,mtezzele/dealii,danshapero/dealii,sriharisundar/dealii,johntfoster/dealii,natashasharma/dealii,kalj/dealii,angelrca/dealii,spco/dealii,Arezou-gh/dealii,shakirbsm/dealii,pesser/dealii,adamkosik/dealii,johntfoster/dealii,YongYang86/dealii,spco/dealii,sriharisundar/dealii,sriharisundar/dealii,lpolster/dealii,msteigemann/dealii,andreamola/dealii,YongYang86/dealii,naliboff/dealii,EGP-CIG-REU/dealii,ibkim11/dealii,JaeryunYim/dealii,kalj/dealii,msteigemann/dealii,maieneuro/dealii,maieneuro/dealii,sairajat/dealii,msteigemann/dealii,natashasharma/dealii,EGP-CIG-REU/dealii,danshapero/dealii,lue/dealii,nicolacavallini/dealii,msteigemann/dealii,rrgrove6/dealii,mac-a/dealii,lpolster/dealii,nicolacavallini/dealii,sriharisundar/dealii,mac-a/dealii,johntfoster/dealii,JaeryunYim/dealii,kalj/dealii,naliboff/dealii,ESeNonFossiIo/dealii,nicolacavallini/dealii,adamkosik/dealii,angelrca/dealii,shakirbsm/dealii,JaeryunYim/dealii,sairajat/dealii,YongYang86/dealii,andreamola/dealii,lpolster/dealii,JaeryunYim/dealii,rrgrove6/dealii,sairajat/dealii,naliboff/dealii,rrgrove6/dealii,danshapero/dealii,Arezou-gh/dealii,lpolster/dealii,naliboff/dealii,natashasharma/dealii,jperryhouts/dealii,jperryhouts/dealii,spco/dealii,rrgrove6/dealii,shakirbsm/dealii,EGP-CIG-REU/dealii,mtezzele/dealii,mac-a/dealii,Arezou-gh/dealii,pesser/dealii,lue/dealii,ibkim11/dealii,mtezzele/dealii,shakirbsm/dealii,angelrca/dealii,msteigemann/dealii,kalj/dealii,danshapero/dealii,Arezou-gh/dealii,ESeNonFossiIo/dealii,mac-a/dealii,ESeNonFossiIo/dealii,gpitton/dealii,natashasharma/dealii,gpitton/dealii,angelrca/dealii,Arezou-gh/dealii,angelrca/dealii,YongYang86/dealii,andreamola/dealii,maieneuro/dealii,lue/dealii,johntfoster/dealii,maieneuro/dealii,nicolacavallini/dealii,shakirbsm/dealii,johntfoster/dealii,sriharisundar/dealii,naliboff/dealii,maieneuro/dealii,nicolacavallini/dealii,adamkosik/dealii,mac-a/dealii,lue/dealii,nicolacavallini/dealii,Arezou-gh/dealii,msteigemann/dealii,spco/dealii,naliboff/dealii,jperryhouts/dealii,jperryhouts/dealii,spco/dealii,pesser/dealii,ibkim11/dealii,EGP-CIG-REU/dealii,mac-a/dealii,mtezzele/dealii,naliboff/dealii,rrgrove6/dealii,JaeryunYim/dealii,spco/dealii,YongYang86/dealii,lue/dealii,danshapero/dealii,andreamola/dealii,johntfoster/dealii,EGP-CIG-REU/dealii,ibkim11/dealii,angelrca/dealii,rrgrove6/dealii,mtezzele/dealii,kalj/dealii,gpitton/dealii,EGP-CIG-REU/dealii,msteigemann/dealii,adamkosik/dealii,lpolster/dealii,lue/dealii,ESeNonFossiIo/dealii,spco/dealii,sriharisundar/dealii,lue/dealii,pesser/dealii,maieneuro/dealii,gpitton/dealii,natashasharma/dealii,pesser/dealii,natashasharma/dealii,adamkosik/dealii,ESeNonFossiIo/dealii,sairajat/dealii,jperryhouts/dealii,ESeNonFossiIo/dealii,ibkim11/dealii,maieneuro/dealii,sairajat/dealii,JaeryunYim/dealii,gpitton/dealii,danshapero/dealii,ibkim11/dealii,gpitton/dealii,ibkim11/dealii,Arezou-gh/dealii,rrgrove6/dealii,danshapero/dealii,EGP-CIG-REU/dealii,ESeNonFossiIo/dealii,shakirbsm/dealii,jperryhouts/dealii,lpolster/dealii,sairajat/dealii,mtezzele/dealii,andreamola/dealii,mac-a/dealii,pesser/dealii,kalj/dealii,sairajat/dealii,lpolster/dealii,jperryhouts/dealii,pesser/dealii,JaeryunYim/dealii,YongYang86/dealii