build: pin lightning-kmp-app to master instead of the jvm-target branch
The submodule was pinned at 05ce7eb, the tip of `claude/jvm-target-actuals`. Move it back to 6434282, the master tip it branched from, which carries the AGP 9.4.0 / jni-android substitution work but none of the jvm actuals. Dropping those four commits from the pin removes the library's jvm target (BusinessManager, the jdbc DbFactory, JvmKeyStore, the polling NetworkMonitor and their tests). The jvm work is not lost -- it stays on `claude/jvm-target-actuals`, pushed to origin. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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