ENH: add the smooth pei bed type

smooth pei plate uses the same parameters as high temp plate
JIRA: STUDIO-4181

Change-Id: I9db8ca7440b5b205902fd4b35af6c24440e1104d
(cherry picked from commit 97e803f62e7d02ff171c2c63e261d319d49ce398)

src/libslic3r/ProjectTask.hpp

@@ -23,8 +23,9 @@ class BBLModelTask;
 enum MachineBedType {
     //BED_TYPE_AUTO = 0,
     BED_TYPE_PC = 0,
-    BED_TYPE_PEI,
     BED_TYPE_PE,
+    BED_TYPE_PEI,
+    BED_TYPE_PTE,
     BED_TYPE_COUNT,
 };