fix: remove code based on wrong assumptions of missing a named placeholder

src/cal_tools/gotthard2/gotthard2lib.py

@@ -6,14 +6,11 @@ import extra_data
 
 
 def map_da_to_source(dc, das, source_template, karabo_id, affixes):
-    if "{input_source_affixes}" in source_template:
-        source_names = [
-            source_template.format(karabo_id=karabo_id, input_source_affixes=aff)  # noqa
-            for aff in affixes
-        ]
-    else:  # e.g 50um doesnt need to have affixes.
-        source_names = [source_template.format(karabo_id=karabo_id)]
-
+    source_names = [
+        source_template.format(
+            karabo_id=karabo_id, input_source_affixes=aff)
+        for aff in affixes
+    ]
     if len(source_names) != len(das):
         raise ValueError(
             "Number of source names (and given affixes) "