Fix a couple of regression tests

library/Demos/MultiRegions/Tests/Helmholtz3D_CG_Hex_AllBCs_petsc_sc_par3.tst

@@ -12,7 +12,7 @@
             <value tolerance="1e-12">0.000416575</value>
         </metric>
         <metric type="Linf" id="2">
-            <value tolerance="1e-12">0.000871589</value>
+            <value tolerance="1e-8">0.000871589</value>
         </metric>
     </metrics>
 </test>

library/Demos/MultiRegions/Tests/Helmholtz3D_CG_Prism_iter_ml_scotch_par3.tst

-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8" ?>
 <test>
     <description>Helmholtz 3D CG, prisms, Neumann BCs, iterative ML, Par(3), Scotch</description>
     <executable>Helmholtz3D</executable>
@@ -9,10 +9,10 @@
     </files>
     <metrics>
         <metric type="L2" id="1">
-            <value tolerance="3e-5">.000388881</value>
+            <value tolerance="3e-5">0.000603666</value>
         </metric>
         <metric type="Linf" id="2">
-            <value tolerance="1e-9">0.00575378</value>
+            <value tolerance="1e-9">0.0102924</value>
         </metric>
     </metrics>
 </test>