Fix displays showing "GPS Not Present" until first lock (#5229)

https://github.com/meshtastic/firmware/pull/5160 introduced a change
which made first publication of GPS information take up to 15mins.
For that initial period, displays would show "No GPS Present", even
if one was detected.

This change fixes that bug, triggering publication immediately after
a GPS module is detected.

src/gps/GPS.cpp

@@ -447,10 +447,12 @@ bool GPS::setup()
                     }
                 }
             }
-            return false;
+        }
 
+        if (gnssModel != GNSS_MODEL_UNKNOWN) {
+            setConnected();
         } else {
-            gnssModel = GNSS_MODEL_UNKNOWN;
+            return false;
         }
 
         if (gnssModel == GNSS_MODEL_MTK) {
@@ -1009,6 +1011,7 @@ int32_t GPS::runOnce()
             }
         }
         GPSInitFinished = true;
+        publishUpdate();
     }
 
     // Repeaters have no need for GPS