Remove flow assert: (#5009)

Rounding in the payment engine is causing an assert to sometimes fire
with "dust" amounts. This is causing issues when running debug builds of
rippled. This issue will be addressed, but the assert is no longer
serving its purpose.

Author: seelabs

src/ripple/app/paths/impl/StrandFlow.h

@@ -834,7 +834,13 @@ flow(
     {
         if (actualOut > outReq)
         {
-            assert(0);
+            // Rounding in the payment engine is causing this assert to
+            // sometimes fire with "dust" amounts. This is causing issues when
+            // running debug builds of rippled. While this issue still needs to
+            // be resolved, the assert is causing more harm than good at this
+            // point.
+            // assert(0);
+
             return {tefEXCEPTION, std::move(ofrsToRmOnFail)};
         }
         if (!partialPayment)