Amend deficit calculation in the power distributor (#577)

- [x] Remove absolute tolerance in floating-point comparison: see
#562 (comment)
for more details
- [x] Remove redundant deficits updates: see
#562 (comment)
for more details
- [x] Consolidate deficits for-loops: see
#562 (comment)
for more details

This is an internal refactoring for the power distribution algorithm
maintaining its functionality, so release notes don't need to be
updated.

Fixes #572

Author: daniel-zullo-frequenz

src/frequenz/sdk/power/_distribution_algorithm.py

@@ -404,32 +404,24 @@ def _distribute_power(  # pylint: disable=too-many-arguments
                 take_from = max(excess_reserved.items(), key=lambda item: item[1])
                 if is_close_to_zero(take_from[1]) or take_from[1] < 0.0:
                     break
-                if take_from[1] >= -deficit or math.isclose(
-                    take_from[1], -deficit, abs_tol=1e-6
-                ):
+                if take_from[1] >= -deficit or math.isclose(take_from[1], -deficit):
                     excess_reserved[take_from[0]] += deficit
                     deficits[inverter_id] = 0.0
                     deficit = 0.0
                 else:
                     deficit += excess_reserved[take_from[0]]
                     deficits[inverter_id] = deficit
                     excess_reserved[take_from[0]] = 0.0
-
-        for inverter_id, excess in excess_reserved.items():
-            distribution[inverter_id] += excess
-            distributed_power += excess
-
-        for inverter_id, deficit in deficits.items():
             if deficit < -0.1:
                 left_over = power_w - distributed_power
                 if left_over > -deficit:
                     distributed_power += deficit
-                    deficit = 0.0
-                    deficits[inverter_id] = 0.0
                 elif left_over > 0.0:
-                    deficit += left_over
                     distributed_power += left_over
-                    deficits[inverter_id] = deficit
+
+        for inverter_id, excess in excess_reserved.items():
+            distribution[inverter_id] += excess
+            distributed_power += excess
 
         left_over = power_w - distributed_power
         dist = DistributionResult(distribution, left_over)