Source & Tools: No EOL Whitespaces

End-of-line (EOL) whitespaces are verbose and increase diffs and
merge conflicts over time.

Cleaned them up for the `Source/`, `Examples/` and `Tools/` directory
with the following bash one-liner:

```bash
find . -type f -not -path './.git*'  \
  -exec sed -i 's/[[:blank:]]*$//' {} \;
```

Committed as generic user so git does not credit the many lines
to me:
```bash
GIT_AUTHOR_NAME="Tools" GIT_AUTHOR_EMAIL="warpx@lbl.gov"  \
  git commit
```

1 files changed, 3 insertions, 3 deletions

diff --git a/Source/Utils/WarpXUtil.cpp b/Source/Utils/WarpXUtil.cpp
index 19e898208..4b11eb69d 100644
--- a/Source/Utils/WarpXUtil.cpp
+++ b/Source/Utils/WarpXUtil.cpp
@@ -68,7 +68,7 @@ void ConvertLabParamsToBoost()
     BL_ASSERT(slice_lo.size() == AMREX_SPACEDIM);
     pp_slice.queryarr("dom_hi",slice_hi,0,AMREX_SPACEDIM);
     BL_ASSERT(slice_hi.size() == AMREX_SPACEDIM);
-    
+
 
     pp_amr.query("max_level", max_level);
     if (max_level > 0){
@@ -113,7 +113,7 @@ void ConvertLabParamsToBoost()
 
 }
 
-/* \brief Function that sets the value of MultiFab MF to zero for z between 
+/* \brief Function that sets the value of MultiFab MF to zero for z between
  * zmin and zmax.
  */
 void NullifyMF(amrex::MultiFab& mf, int lev, amrex::Real zmin, amrex::Real zmax){
@@ -143,7 +143,7 @@ void NullifyMF(amrex::MultiFab& mf, int lev, amrex::Real zmin, amrex::Real zmax)
                     const Real z_gridpoint = zmin_box+(k-lo_ind)*dz;
 #else
                     const Real z_gridpoint = zmin_box+(j-lo_ind)*dz;
-#endif 
+#endif
                     if ( (z_gridpoint >= zmin) && (z_gridpoint < zmax) ) {
                         arr(i,j,k) = 0.;
                     };