Revert "the default value for the EnablePQConfigTransactionsAtSchemeShard flag" (#1434)

Author: CyberROFL

ydb/core/protos/feature_flags.proto

@@ -103,7 +103,7 @@ message TFeatureFlags {
     optional bool EnableExternalDataSources = 88 [default = false];
     optional bool EnableTopicDiskSubDomainQuota = 89 [default = true];
     optional bool EnableSeparationComputeActorsFromRead = 90 [default = false];
-    optional bool EnablePQConfigTransactionsAtSchemeShard = 91 [default = true];
+    optional bool EnablePQConfigTransactionsAtSchemeShard = 91 [default = false];
     optional bool EnableScriptExecutionOperations = 92 [default = false];
     optional bool EnableImplicitQueryParameterTypes = 93 [default = true];
     optional bool EnableForceImmediateEffectsExecution = 94 [default = false];