MOBILE-2103 core: Fix some icons color
MOBILE-2103 core: Fix some icons color

beppinu/moodleapp,knurmi/MoodleTest,sulzer/moodlemobile2,arahimahmad/moodlemobile2,NEEDS-SAL/SOrCEv3,chester666/moodlemobile,bmmg888/moodlemobile2,romit19/SOrCEv3,arahimahmad/moodlemobile2,romit19/SOrCEv3,chester666/moodlemobile,chester666/moodlemobile,knurmi/MoodleTest,sulzer/moodlemobile2,beppinu/moodleapp,romit19/SOrCEv3,dpaloucva/moodlemobile2,bmmg888/moodlemobile2,bmmg888/moodlemobile2,NEEDS-SAL/SOrCEv3,bmmg888/moodlemobile2,romit19/SOrCEv3,NEEDS-SAL/SOrCEv3,NEEDS-SAL/SOrCEv3,romit19/SOrCEv3,romit19/SOrCEv3,arahimahmad/moodlemobile2,NEEDS-SAL/SOrCEv3,sulzer/moodlemobile2,NEEDS-SAL/SOrCEv3,dpaloucva/moodlemobile2