Update Unity.gitignore

Removes queried extensions.

Unity.gitignore

@@ -7,7 +7,6 @@
 *.csproj
 *.unityproj
 *.sln
-*.sln.DotSettings
 *.suo
 *.tmp
 *.user
@@ -21,7 +20,3 @@
 # Unity3D Generated File On Crash Reports
 sysinfo.txt
 
-# General operating system files
-*.DS_STORE
-*.db
-