Restrict dominant sparks to pulling from a single spark per tick

The changes in VazkiiMods#4963 generally
fixed behaviors associated with establishing and re-establishing mana
transfers to dominant sparks, but I think introduced an unintended
consequence: it made it possible for dominant sparks to receive
`TRANSFER_RATE` mana every tick from each unaugmented spark in range.

Prior to the change, a dominant spark could receive at most `TRANSFER_RATE`
mana from a single pool per tick. This change restores that behavior.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: cjlarose

Xplat/src/main/java/vazkii/botania/common/entity/ManaSparkEntity.java

@@ -284,6 +284,7 @@ public void updateTransfers() {
 					SparkUpgradeType otherUpgrade = spark.getUpgrade();
 					if (spark != this && otherUpgrade == SparkUpgradeType.NONE && spark.getAttachedManaReceiver() instanceof ManaPool) {
 						inboundTransfers.add(spark);
+						break; // Only add one spark
 					}
 				}
 			}