MOBILE-1812 ws: Fix getRemoteFileMimeType if charset specified
MOBILE-1812 ws: Fix getRemoteFileMimeType if charset specified

mohitsofat/mobiskool,chester666/moodlemobile,bmmg888/moodlemobile2,chester666/moodlemobile,romit19/SOrCEv3,NEEDS-SAL/SOrCEv3,NEEDS-SAL/SOrCEv3,Diaa75/moodlemobile2,dpaloucva/moodlemobile2,bmmg888/moodlemobile2,digidoug/fsdmoodle,NEEDS-SAL/SOrCEv3,romit19/SOrCEv3,balirwa/logs,Andydadra/moodlemobile2,bmmg888/moodlemobile2,sulzer/moodlemobile2,Diaa75/moodlemobile2,arahimahmad/moodlemobile2,arahimahmad/moodlemobile2,romit19/SOrCEv3,balirwa/logs,jnguy054/moodlemobile2,romit19/SOrCEv3,arahimahmad/moodlemobile2,balirwa/logs,mohitsofat/mobiskool,beppinu/moodleapp,MUPC-GH/MobileMoodle3.2.0,testvibid/imaritime,bmmg888/moodlemobile2,sulzer/moodlemobile2,beppinu/moodleapp,Andydadra/moodlemobile2,NEEDS-SAL/SOrCEv3,mvvkiev/moodlemobile2,knurmi/MoodleTest,chester666/moodlemobile,balirwa/logs,mvvkiev/moodlemobile2,testvibid/imaritime,mohitsofat/mobiskool,romit19/SOrCEv3,romit19/SOrCEv3,sulzer/moodlemobile2,NEEDS-SAL/SOrCEv3,jnguy054/moodlemobile2,digidoug/fsdmoodle,knurmi/MoodleTest,NEEDS-SAL/SOrCEv3,dpaloucva/moodlemobile2,balirwa/logs,MUPC-GH/MobileMoodle3.2.0,balirwa/logs