Remove ".iso" from other artifact's names (refs: #15990)

auto/build

@@ -138,10 +138,10 @@ case "$LB_BINARY_IMAGES" in
       ;;
 esac
 BUILD_ISO_FILENAME="${BUILD_BASENAME}.iso"
-BUILD_MANIFEST="${BUILD_ISO_FILENAME}.build-manifest"
-BUILD_APT_SOURCES="${BUILD_ISO_FILENAME}.apt-sources"
-BUILD_PACKAGES="${BUILD_ISO_FILENAME}.packages"
-BUILD_LOG="${BUILD_ISO_FILENAME}.buildlog"
+BUILD_MANIFEST="${BUILD_BASENAME}.build-manifest"
+BUILD_APT_SOURCES="${BUILD_BASENAME}.apt-sources"
+BUILD_PACKAGES="${BUILD_BASENAME}.packages"
+BUILD_LOG="${BUILD_BASENAME}.buildlog"
 BUILD_USB_IMAGE_FILENAME="${BUILD_BASENAME}.img"
 
 # Clone all output, from this point on, to the log file