fix(profiling): Need to sample profile correctly (#1679)

This is fixing a mistake from #1676, and adding a sample at the start of the
profile instead of waiting 1 interval before getting the first sample.

sentry_sdk/profiler.py

@@ -454,6 +454,8 @@ def make_run(self, event):
 
         def run():
             # type: () -> None
+            self.sampler()
+
             last = time.perf_counter()
 
             while True:
@@ -471,7 +473,7 @@ def run():
                 if event.is_set():
                     break
 
-            self.sampler()
+                self.sampler()
 
         return run
 
@@ -490,6 +492,8 @@ def make_run(self, event):
 
         def run():
             # type: () -> None
+            self.sampler()
+
             while True:
                 event.wait(timeout=self._interval)
 
@@ -498,8 +502,6 @@ def run():
 
                 self.sampler()
 
-            self.sampler()
-
         return run