Update digits in project invoice test scenario

Since 7c7f60798d49, get_total is always rounding the value with the currency
digits.

modules/project_invoice/tests/scenario_project_invoice_effort.rst

@@ -131,7 +131,7 @@ Check project amounts::
 
     >>> project.reload()
     >>> project.invoiced_amount
-    Decimal('0')
+    Decimal('0.00')
     >>> project.amount_to_invoice
     Decimal('0.00')
 
@@ -144,7 +144,7 @@ Check project amounts::
 
     >>> project.reload()
     >>> project.invoiced_amount
-    Decimal('0')
+    Decimal('0.00')
     >>> project.amount_to_invoice
     Decimal('100.00')
 

modules/project_invoice/tests/scenario_project_invoice_multiple_party.rst

@@ -80,7 +80,7 @@ Check project amounts::
     >>> project.amount_to_invoice
     Decimal('0.00')
     >>> project.invoiced_amount
-    Decimal('0')
+    Decimal('0.00')
 
 Do project and subproject::
 
@@ -95,7 +95,7 @@ Check project amounts::
     >>> project.amount_to_invoice
     Decimal('120.00')
     >>> project.invoiced_amount
-    Decimal('0')
+    Decimal('0.00')
 
 Invoice project::