Removed the vi format comments from the source

Vim users can use the [editorconfig plugin](https://github.com/editorconfig/editorconfig-vim) to automatically set tab spacing for the SDL coding style.

Fixes https://github.com/libsdl-org/SDL/issues/6903

src/misc/SDL_sysurl.h

@@ -29,5 +29,3 @@ extern int SDL_SYS_OpenURL(const char *url);
 #ifdef __cplusplus
 }
 #endif
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/SDL_url.c

@@ -29,5 +29,3 @@ int SDL_OpenURL(const char *url)
     }
     return SDL_SYS_OpenURL(url);
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/android/SDL_sysurl.c

@@ -27,5 +27,3 @@ int SDL_SYS_OpenURL(const char *url)
 {
     return Android_JNI_OpenURL(url);
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/dummy/SDL_sysurl.c

@@ -26,5 +26,3 @@ int SDL_SYS_OpenURL(const char *url)
 {
     return SDL_Unsupported();
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/emscripten/SDL_sysurl.c

@@ -33,5 +33,3 @@ int SDL_SYS_OpenURL(const char *url)
 
     return 0;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/haiku/SDL_sysurl.cc

@@ -30,6 +30,3 @@ SDL_SYS_OpenURL(const char *url)
     const status_t rc = burl.OpenWithPreferredApplication(false);
     return (rc == B_NO_ERROR) ? 0 : SDL_SetError("URL open failed (err=%d)", (int) rc);
 }
-
-/* vi: set ts=4 sw=4 expandtab: */
-

src/misc/ios/SDL_sysurl.m

@@ -33,5 +33,3 @@ int SDL_SYS_OpenURL(const char *url)
         return [[UIApplication sharedApplication] openURL:nsurl] ? 0 : -1;
     }
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/macos/SDL_sysurl.m

@@ -33,5 +33,3 @@ int SDL_SYS_OpenURL(const char *url)
         return status == noErr ? 0 : -1;
     }
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/riscos/SDL_sysurl.c

@@ -44,5 +44,3 @@ int SDL_SYS_OpenURL(const char *url)
 
     return (regs.r[0] & 1) ? SDL_SetError("Couldn't open given URL.") : 0;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/unix/SDL_sysurl.c

@@ -66,5 +66,3 @@ int SDL_SYS_OpenURL(const char *url)
         }
     }
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/vita/SDL_sysurl.c

@@ -39,5 +39,3 @@ int SDL_SYS_OpenURL(const char *url)
     sceAppUtilLaunchWebBrowser(&browser_param);
     return 0;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/windows/SDL_sysurl.c

@@ -57,5 +57,3 @@ int SDL_SYS_OpenURL(const char *url)
     return (rc > ((HINSTANCE)32)) ? 0 : WIN_SetError("Couldn't open given URL.");
 }
 #endif
-
-/* vi: set ts=4 sw=4 expandtab: */

src/misc/winrt/SDL_sysurl.cpp

@@ -36,5 +36,3 @@ int SDL_SYS_OpenURL(const char *url)
     Windows::System::Launcher::LaunchUriAsync(uri);
     return 0; // oh well, we're not waiting on an async task here.
 }
-
-/* vi: set ts=4 sw=4 expandtab: */