Solver: Fix case of space into solver path.

src/config.py

@@ -254,7 +254,7 @@ class Config(SQL):
         ctor = solver_type_list["mage8"]
         new = ctor("default-mage")
         new._description = "Default PAMHYR mage 8 version"
-        new._cmd_solver = f"""@install_dir/mage/mage{"" if posix else ".exe"} -fp=1 @input"""
+        new._cmd_solver = f""""@install_dir/mage/mage{"" if posix else ".exe"}" -fp=1 @input"""
         self._solvers.append(new)
 
         # Meshing tool