pombast: mega-melt-template -> melt-template

The "mega" is a less important distinction now that the pombast
infrastructure is in place. It's the melt operation of pombast,
so for consistency, the template can be melt-template.xml.

Author: ctrueden

pombast.toml

@@ -74,7 +74,7 @@ includes = [
 java-version = 21
 properties = { "scijava.jvm.version" = "21" }
 
-template = "pombast/mega-melt-template.xml"
+template = "pombast/melt-template.xml"
 excludes = [
     # TEMP: Exclude org.bytedeco:hdf5 until cisd:jhdf5 is gone.
     'org.bytedeco:hdf5',