Test fixup: 'yes' being YAML synonym for 'true' is dubious

See: https://stackoverflow.com/q/57682657/176841

I don't think this is something we care about, and we need to fix this
for ruamel which uses the more sane v1.2 spec.

server/tests-py/queries/graphql_query/boolexp/jsonb/setup.yaml

@@ -119,7 +119,7 @@ args:
         Disk: 128GB
         Weight: 1.2Kg
         Processor: processor2
-        Touchscreen: yes
+        Touchscreen: true
 
     - category: Mobile
       name: mobile1
@@ -131,7 +131,7 @@ args:
         Network type: 4G
         SIM type: DualSim
         Sensors: Accelerometer sensor, E-compass, Proximity sensor
-        Touchscreen: yes
+        Touchscreen: true
 
     - category: Electric kettle
       name: kettle1

server/tests-py/queries/v1/select/boolexp/jsonb/setup.yaml

@@ -119,7 +119,7 @@ args:
         Disk: 128GB
         Weight: 1.2Kg
         Processor: processor2
-        Touchscreen: yes
+        Touchscreen: true
 
     - category: Mobile
       name: mobile1
@@ -131,7 +131,7 @@ args:
         Network type: 4G
         SIM type: DualSim
         Sensors: Accelerometer sensor, E-compass, Proximity sensor
-        Touchscreen: yes
+        Touchscreen: true
 
     - category: Electric kettle
       name: kettle1