test(recompiler): set layerExported in the disk cache entry round trip

#5097 added ShaderInfo::layerExported to the entry encoder, and this
series moves that line into encodeShaderInfo, which plan entries use
too. The entry round trip left the flag false, so an encoder and a
decoder that both skipped it still passed. Set it like the other
ShaderInfo flags: with layerExported dropped from both, the round trip
now fails with "entry round trip: shader info differs".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

core/libs/prx/libSceAgcDriver/tests/ShaderDiskCache.cpp

@@ -253,6 +253,7 @@ CompiledVariant sampleVariant() {
     info.info.usesDma = true;
     info.info.usesFaultBuffer = true;
     info.info.rasterPrimitive = true;
+    info.info.layerExported = true;
     info.bindings.pushDataStartDword = 2;
     info.bindings.memoryOffsetDword = 1;
     info.bindings.memoryOffsetCount = 5;