[explorer][s]: very small but significant fix to set viz using viewport height (done properly).
[explorer][s]: very small but significant fix to set viz using viewport height (done properly).

openspending/openspendingjs,openspending/openspendingjs-old,openspending/openspendingjs-old,openspending/openspendingjs-old,openspending/openspendingjs,openspending/openspendingjs-old,RCGTDev/openspendingjs,RCGTDev/openspendingjs,RCGTDev/openspendingjs,RCGTDev/openspendingjs,openspending/openspendingjs,openspending/openspendingjs