datetime: Fix edc sizing issue by putting fixed: 1 1.

Datetime edc is wrongly designed. Setting heuristic min value for the part is bad :(
This is a hotfix for the following error message when there is a button
for AMPM.

group elm/datetime/base/default has a non-fixed part 'field3'. Adding
'fixed: 1 1;' to source EDC may help. Continuing discarding faulty part.

@fix

legacy/elementary/data/themes/edc/elm/datetime.edc

@@ -7,7 +7,7 @@
          visible: 0; \
          min: 0 0; \
          align: 0.0 0.5; \
-         fixed: 1 0; \
+         fixed: 1 1; \
          rel1.relative: 1.0 0.0; \
          rel1.to: "separator"#_pos; \
          rel2.relative: 1.0 1.0; \