build: Simplify macro expression
# bnd instructions for companion code projects
spec.package.versionattr: ${packageattribute;${def;spec.package;${bsn}};version}
-spec.version = ${versionmask;===;${if;${spec.package.versionattr};${spec.package.versionattr};0}}
+spec.version = ${versionmask;===;${first;${spec.package.versionattr};0}}
build.version = ${build.versionmask;${spec.version}}.${project.build}
Automatic-Module-Name: ${bsn}
Bundle-Description: OSGi Companion Code for ${bsn} Version ${spec.version}
