sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ief05bd757cffb1453e058a719ee4b060861752e7
diff --git a/power-supply/main.cpp b/power-supply/main.cpp
index 00dae73..b526264 100644
--- a/power-supply/main.cpp
+++ b/power-supply/main.cpp
@@ -127,7 +127,7 @@
         psuDevice->enableHistory(basePath, numRecords, syncGPIOPath, gpioNum);
 
         // Systemd object manager
-        sdbusplus::server::manager::manager objManager{bus, basePath.c_str()};
+        sdbusplus::server::manager_t objManager{bus, basePath.c_str()};
 
         std::string busName =
             std::string{INPUT_HISTORY_BUSNAME_ROOT} + '.' + name;