fix: assign the right place to SGG IATA code

Additionally, removed Simanggang Airport entry, as it is seems the
airport is closed and `WBGY` ICAO code is not assigned to any other
airport.

References:
- https://en.wikipedia.org/wiki/Sermiligaaq_Heliport
- https://ourairports.com/comments/15800/
- http://www.malaysianwings.com/forum/index.php?/topic/1011-closed-airstrip/

airportsdata/airports.csv

@@ -4878,6 +4878,7 @@
 "BGPT","JFR","Paamiut Airport","Paamiut","","GL",120,62.0147361755,-49.6709365845,"America/Nuuk",""
 "BGQQ","NAQ","Qaanaaq Airport","Qaanaaq","","GL",51,77.4886016846,-69.3887023926,"America/Thule",""
 "BGSF","SFJ","Kangerlussuaq Airport","Kangerlussuaq","Qeqqata","GL",165,67.0122218992,-50.7116031647,"America/Nuuk",""
+"BGSG","SGG","Sermiligaaq Heliport","Sermiligaaq","Sermersooq","GL",33,65.905833,-36.378333,"America/Nuuk",""
 "BGSS","JHS","Sisimiut Airport","Sisimiut","","GL",33,66.9513015747,-53.7293014526,"America/Nuuk",""
 "BGTL","THU","Thule Air Base","Thule","Qaasuitsup","GL",251,76.5311965942,-68.7032012939,"America/Thule",""
 "BGUK","JUV","Upernavik Airport","Upernavik","","GL",414,72.7901992798,-56.1305999756,"America/Nuuk",""
@@ -25834,7 +25835,6 @@
 "WBGT","TGC","Tanjung Manis Airport","Tanjung Manis","Sarawak","MY",15,2.1778399944,111.202003479,"Asia/Kuching",""
 "WBGU","LSU","Long Sukang Airport","Long Sukang","Sarawak","MY",1200,4.5522198677,115.4940032959,"Asia/Kuching",""
 "WBGW","LWY","Lawas Airport","Lawas","Sarawak","MY",5,4.849170208,115.4079971313,"Asia/Kuala_Lumpur",""
-"WBGY","SGG","Simanggang Airport","Simanggang","Sarawak","MY",35,1.2170000076,111.4499969482,"Asia/Kuching",""
 "WBGZ","BBN","Bario Airport","Bario","Sarawak","MY",3350,3.7338900566,115.4789962769,"Asia/Kuala_Lumpur",""
 "WBKA","SMM","Semporna Airport","Semporna","Sabah","MY",60,4.4499998093,118.5830001831,"Asia/Kuching",""
 "WBKB","","Kota Belud Airport","Kota Belud","Sabah","MY",46,6.3651599884,116.4710006714,"Asia/Kuching",""