Fix mbbi item string length

ADOrcaApp/Db/orca.template

@@ -1676,9 +1676,9 @@ record(mbbi, "$(P)$(R)FrameStampProd-R") {
     field(DESC, "Timestamp produced source")
     field(DTYP, "asynInt32")
     field(ZRVL, "2")
-    field(ZRST, "Frame timestamp DCAM module")
+    field(ZRST, "DCAM module")
     field(ONVL, "5")
-    field(ONST, "Frame timestamp image device")
+    field(ONST, "Image device")
     field(INP,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))H_FRAMESTAMP_PRODUCER")
     field(SCAN, "I/O Intr")
 }