Use simple project name as alias

[sormuras]

There is a shift in naming patterns of EA builds published at https://jdk.java.net/ - take the following two map entries as an example:

# ...
26,26-jep401ea2+1-1,windows,x64=https://download.java.net/java/early_access/valhalla/26/1/openjdk-26-jep401ea2+1-1_windows-x64_bin.zip
26,26-leydenpremain+1,linux,aarch64=https://download.java.net/java/early_access/leyden/1/openjdk-26-leydenpremain+1_linux-aarch64_bin.tar.gz
# ...

In former times, it would have been just leyden instead of leydenpremain and valhalla instead of jep401ea2. The name of the project, with some build-related suffix.

Adopt this action to the naming pattern shift by always using the simple project name as an alias.