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: I592583489212a3a7d3fc48cedac2a97489aa149b
diff --git a/src/mainapp.cpp b/src/mainapp.cpp
index ef9b353..7d64ec7 100644
--- a/src/mainapp.cpp
+++ b/src/mainapp.cpp
@@ -223,7 +223,7 @@
         auto bus = sdbusplus::bus::new_default();
 
         // Add systemd object manager.
-        sdbusplus::server::manager::manager watchdogManager(bus, path.c_str());
+        sdbusplus::server::manager_t watchdogManager(bus, path.c_str());
 
         // Attach the bus to sd_event to service user requests
         bus.attach_event(event.get(), SD_EVENT_PRIORITY_NORMAL);
@@ -233,7 +233,7 @@
                           std::move(maybeFallback), minInterval,
                           defaultInterval);
 
-        std::optional<sdbusplus::bus::match::match> watchPostcodeMatch;
+        std::optional<sdbusplus::bus::match_t> watchPostcodeMatch;
         if (watchPostcodes)
         {
             watchPostcodeMatch.emplace(