Rename development demo combo defintion example file so that it actually works

Source/Images/devDemo.def.example

@@ -0,0 +1,17 @@
+# This image definition generates a disk image containing
+# all of the available language disk slices.
+# Remove the ".example" suffix from this
+# file and to cause the RomWBW build process to
+# create the "demo_dev" disk image.
+
+# This is the programming language demo development Combo image for RomWBW
+
+cpm22
+ws4
+aztecc
+bascomp
+tpascal
+fortran
+cobol
+z80asm
+games