Add a blank line to the end of is_positive_num()

The return statement is too close to the block above it, so I want to
space it out for aesthetics.

desktop_version/src/UtilityClass.cpp

@@ -313,6 +313,7 @@ bool is_positive_num(const char* str, const bool hex)
 			}
 		}
 	}
+
 	return true;
 }